Malicious PDF — malware analysis report

Static analysis result for SHA-256 2750d356eb31da7f…

MALICIOUS

PDF

92.2 KB Created: 2021-08-14 03:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8032dc6c78fcc784863db494f00fe70 SHA-1: 37f254c991df58a6e59dd0520be0d984d8afc318 SHA-256: 2750d356eb31da7f93a3f3400fcdf165cc1053ca781bdcd5c03a90bb423a0975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms within documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/44d3735d0be0f12437e559f58718d154/butajexatog.pdf In PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0529/796acdfc90e4f565dabfedf5374656bd.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/dogisikawuva.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/sadoxibupifuw.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/55865836421.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/70302130877.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798bd38d5b6---65485255206.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106261255438476.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a65ee9413---kulizojefexowadatowaxa.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/sezefobegazamomil.pdfIn PDF document text
    • http://fedime.org/imagenes/52523718216.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/91379664519.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/22912134186.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083466f4273d---wotutebexipazikutexuv.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/3166708850.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083a5d360596---20750577114.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/monajelobegerupefa.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c74f0de23e21a0a814ec95976787b7ba/91311412853.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/rafeludekokujetivosukawen.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/undhgmuiofthhpof8lau02vq23/jegati.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6e4b73d7c---36096593810.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/22426924984.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/63dddb9d6c550017279056c1dc113a00/94963279331.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608386378c3b8---84488072257.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/xaderozulesarotemekedoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+long+does+it+take+for+tadpoles+to+grow+legsPDF link annotation
    • https://mediaget.com/userfiles/files/mewuwuzufukilos.pdfIn PDF document text
    • 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_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 10844 bytes
SHA-256: 5e02fb1681cddbb0169f9f88da940276b632d1a47aa52b82ca2b60520eb59471
font_02_sfnt_off0001328a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328A 17652 bytes
SHA-256: e3e078e6116a6b06f6c35dd0d46d34f178de96f18ee78a2fc4016f7c7e46d952

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