Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e5be5c634e6e40…

MALICIOUS

PDF

96.3 KB Created: 2021-08-24 02:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61c57ed31bd09eae05fee245c423a952 SHA-1: 905d8c853297b555f2e8ff0fa39940ecfc43c23d SHA-256: 12e5be5c634e6e4056d8eb5c7d1a3ed8d6fbdc86884ffe1178f86945a0bc5f76
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a callback phishing lure. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or facilitate a phishing scheme. The presence of multiple URLs hosted on compromised CMS upload directories further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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) 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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be74b33a6bf---famufetusakaf.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/suvaxibukofukezodidofaxu.pdf
    • https://bestcoloringpages.com/userfiles/file/99310758977.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a48f550c1b1---99278934429.pdf
    • https://bistakalikotenetwork.com/userfiles/file/dinamilof.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160710e178cd2b---83993557789.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/potavunimezo.pdf
    • http://littlefreddieking.com/clients/65037/File/40975479226.pdf
    • http://www.vegagastro.pl/upload/file/16707796624.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fnppt8tv61pb5terb5r0s709k9/xexexisaxibiji.pdf
    • https://777mto.com/contents//files/59035920216.pdf
    • https://partner-support.net/user_data/userfiles/files/52572252711.pdf
    • http://arunimaflavours.com/userfiles/file/vonibupeni.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/lixekadeverolu.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948658e42c0---nojatagujetavavezapuzidem.pdf
    • https://davaocarrental.com/images/file/36728458057.pdf
    • http://megat.pl/uploaded/fck_files/file/10398753523.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/c9712fdd698201a1b507e017bba3cd0b/27507137795.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16095a41d0ed05---tuxajusutol.pdf
    • https://foodphotoshop.com/userfiles/files/51377088567.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1c8f1a35cbeb61ac7c1e9e0f2f262f9d/85628508468.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7c4f9994c2b35b4e59d8597474227a34/zajulitu.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8385e91a7766c5ef28ba391aa413b549/30877297918.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e4649ee4---vazagidorumuxalozu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=draping+for+apparel+design+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115c1.bin
6879b2d759a2dad6a3d4d94bf26957e0fa8aea26390ee5f604e686b3817c8299
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 10664 bytes
font_01_sfnt_off00012e15.bin
682a1f15343f3fd349fda711125b065b84a469b521e420125caf42db84beae81
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 16652 bytes
font_02_sfnt_off0001583b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1583B 16792 bytes