Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6d551515daeb0c…

MALICIOUS

PDF

89.8 KB Created: 2021-07-26 07:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae0990a7718dcc21f90b3419ca549c43 SHA-1: dc6260be6aeb3621ad727bf23ce54937d5e185c9 SHA-256: 2c6d551515daeb0c151fc1cffdc33b4ffebad269aafe5945ff8dba0b6f716192
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, which likely serve as a link farm to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the true malicious destination. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aloeverajuice.cz/files/file/90616647547.pdf In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0508b95c53619d02991003db03156be1/15054007557.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37085e38d4---94878402724.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/45ebeda9463018e7c2e31b8c1839d29d/nojazaten.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089f93e79281---sebipefozawidaf.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/09d850ef6d47e65f0a5b90283501250a/53361632331.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/42989838373.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/530b8380073bbd1459176fd2b0051454/49878854541.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/74784118668.pdfIn PDF document text
    • http://apvn.info/userfiles/file/kajuzudojom.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a1d26d431---kafunebomagupuvonaziwel.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/gediziwonawubagom.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/raxanugasukinevi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e57f17df---dafopewujenatumepuzob.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/l1r4h59q3tj57g6h04alqqecm7/25627327237.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/zovevibunubuno.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3a4ed9bc---femujubebumox.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fpdhkob7abdr7abhe2goe28mi3/26948521193.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/7t89veucfgfrv3l9eqhe631t46/88233308462.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16087af4b0d938---kivibexamufeje.pdfPDF link annotation
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93808073732.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e543c2831---63643132125.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/libatixapulugirajivunizi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b9b5cb72---34270771168.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/edc17f4553149c244c502c0bcb2d41b6/89934891710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=does+power+of+attorney+have+to+be+notarized+in+alabamaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 17052 bytes
SHA-256: d19130b71ab2d214955965cd9f7945afc87b91bffc414b615196551e77045b65
font_01_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4F 11232 bytes
SHA-256: 8fbefca315bd173cc4797f3f97180a405467315d64aef368a6618cef0ee6d1e0

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