Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e3cc9a5c4f6d4b…

MALICIOUS

PDF

85.6 KB Created: 2021-07-01 15:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3821e7797297be97dc5ee96913d01763 SHA-1: 4ba59325b3cc6c4b9de8c596bcb0f61bd7cfa570 SHA-256: 21e3cc9a5c4f6d4b38c6911bcbfd65126292a75fb5269bda9079d7cea69cb722
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the document as a link farm, with many embedded URIs pointing to compromised WordPress sites. These links are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mi2nc4bssagn3aplvelpp53d30/79373147304.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0b84a429bdc2ba96f5192620eaad4049/49963766946.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b368e95---ruforonumipe.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092abefbc6c7---nepawalimakojusifalava.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/88492884498.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a11d0c3ef72bf6ab87d14bb5b0af8830/70478103054.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f88e945a2---dejilagi.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/derobipoj.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e9fcafce21d33dd3216e0fcaa003d53a/96725849309.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3e82f25f---78330451571.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/71783010606.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608201543b351---31373944645.pdfPDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59d530788f---78140970236.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/37038071745.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8vj1lsb2qcgjivm0o187pnvqe1/sulatatage.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bbe400c5c---wusaluga.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/nubaxoworufitojisasaro.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/junabavizife.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/wiganes.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fma1cj9u8ga5vrkj1v760g0v60/kobofonawunimukoxamew.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pjo039qnl2qoe5dmq8mqf35h85/kukudovupifiz.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbdaeef899---3819714980.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/22155544199.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d231a4ed90a---mipapulifuxovixeropu.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/ctpe5q5sj5uib41iuu7tfblnem/72343777336.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/87456123345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=example+of+negative+reinforcement+in+psychologyPDF 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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 17316 bytes
SHA-256: 3433e1dbccefe5ead0b33364f15dd86fc1a584d5a99734b9639727ff82a79113
font_01_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 11192 bytes
SHA-256: e037d6da5f4a4a2e5c554a6b2640de0dfb724634e32244c6e4ab3978448a475c
font_02_sfnt_off000130a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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