Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae25d2ecb05a83e…

MALICIOUS

PDF

87.9 KB Created: 2021-08-03 18:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df5c1c26cecdcb0a7d8c492063594653 SHA-1: e35123a9f90a4d12562a3c9e371fe53f072c5b98 SHA-256: 3ae25d2ecb05a83e966b59adc237239e7a4032f7662c5662d5ed81065991d947
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it is used to distribute or redirect to malicious content. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic suggest a phishing or scam attempt, likely involving directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://dishandspoonproductions.com/ckfinder/userfiles/files/52158921555.pdf In PDF document text
    • https://o-dance.com/upload/files/mowezimila.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/60546827719.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c7201870c---84850588554.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/j6b53ql5h9erug76r2t9lbbtmp/57210941729.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001f1ade383---66485089455.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc5985f53---26914895896.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/40724578802.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/gimus.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/jelesefitoxiwat.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/guwenosaletojafogemizo.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/18629045683.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/26706997692.pdfIn PDF document text
    • http://eva.am/files/ca3718b70c37bec2.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607801c942348---pigawil.pdfIn PDF document text
    • http://vanhacollection.com/images/files/rakexoda.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/bifosalimebuvuzafogi.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c335f03f2fdc5053243fd3945db3fc32/daxoxurevenilazirogusefod.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081a939dd288---17069674120.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2a0374c65f9c0177162158cae3c69972/93211081139.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/22555042451.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085854230168---dalibovagagawesebizapanu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/72a2b375dee925b2d34200494f23709f/nuwenupupipev.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc91e43b5b9---romixa.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/48509957032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+print+2+pages+per+sheet+mac+previewPDF 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_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 16788 bytes
SHA-256: b78b18acbe06d61add9030b7c9259d6cec2be5cf783a7fb116780b2fe60f7cb0
font_01_sfnt_off00011f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001373d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 11036 bytes
SHA-256: c61cabdd9f5142fb536f743ef17b0034ed57c136c22df599cf5e22bc878238bb