Malicious PDF — malware analysis report

Static analysis result for SHA-256 13af477754809a04…

MALICIOUS

PDF

85.5 KB Created: 2021-07-15 14:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd4065b31d3eb11ed1d985fa7ff77dce SHA-1: 8688643f328ff11e6f0d302980b4b0a47ba5f928 SHA-256: 13af477754809a0461ca330f16da140c127c069097ca18045671d163b226c2eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it is designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing payload or exploit. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://okwecare.com/usr/userfiles/files/24188182025.pdf In PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d39ee128ffd---petop.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59c892bf8---ropofor.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/690607b66436cbc1a6de1f8a9cc11c4b/wimuzanopibixemenuvig.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da22862fb1---47867250895.pdfIn PDF document text
    • http://dges.in/userfiles/file/20598630158.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c7702df0---11817947293.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94bedad8b---70486735398.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/lazedosekawekox.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5c1c8fae77bb4a111e0a9461171e2c9a/pazabukebonapereneka.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6e6fa7966---66557989426.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/nerakadaxufoxinafovatul.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/56860978644.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/tofomijoj.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/rekubejekajimedanokajokug.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0477ba6dc1eaecb9205314694678e120/18181204010.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3e755a339d9e3ba51264419ea210ffcd/22043810147.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a75c61effb3---mubebuvugedif.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rhiarrjailacimb4gde9lc29st/8551178601.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/65937727282.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608871487f230---98480966838.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/37ad2c85cf4b86fa78ef1d9963791c0a/vijapufamevudisabomufa.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7667ebbad5201e8b1b7ffa99997c7a03/tuvuv.pdfIn PDF document text
    • https://lesura.net/userfiles/file/gilejafofezilax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=environmental+impacts+of+monoculturePDF 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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 16272 bytes
SHA-256: 4722f3b47195981b1cf7d8102c7509a9a68067b08968d018d6a669c5820b59cf
font_01_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 10792 bytes
SHA-256: 656127b3341dd6e94c4c7e19e0d81312d7dfba406d182ce3fcdb7d12d83fe717
font_02_sfnt_off00012ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1