Malicious PDF — malware analysis report

Static analysis result for SHA-256 644a9f1d6f548529…

MALICIOUS

PDF

102.1 KB Created: 2021-06-29 09:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fdbf8ffad4d4901b89adf7bc10ada88 SHA-1: 20f9a6cfe1eb5d9343d291e6807694ee6559f2cd SHA-256: 644a9f1d6f548529f7cfe5a11364686b5efb9d00f7aff270a6461301ffa87189
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains identified as disposable or compromised, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://amadpich.com/userfiles/file/21977622510.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608045da8bca8---vugetijedejesagisetex.pdf
    • https://newtech-utm.pl/userfiles/file/fufejiperejuliribafe.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/02afb447381fa2795d1efebd290bb231/5266614812.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cfba80f384ecfd78b445719cf7d1fe87/gupove.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2baf8915748469ff9b9751ec102ea841/badaserafarezewofaruduno.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/75922846660.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9a93fc34---50420210236.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a5b5d1636cbff91bb43a2d13c4fd8348/45693320535.pdf
    • http://asokmontridental.com/userfiles/file/50669217868.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d98046802c481af45080d26df3fdfe4e/74718112225.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/eca79888ac771a0747b1f5bdefa9368b/kebovurowebefofomajagox.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b5e06abc9---65599491816.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a71162afaf6---11558661057.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096afb6e514c---3995992047.pdf
    • http://arniestribu.com/campannas/file/24484287083.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde404dec4c---26144431602.pdf
    • http://seabeachthailand.com/UserFiles/file/vuwedusutuk.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff9bef9f1---7674162429.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9e398d35---mutawokirojukibaser.pdf
    • http://charivne.info/images/file/kozowamusifepizupife.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a778c6e1cb---wupaletusazi.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073207a0a45b---11991345824.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f654edcc4---koxagagimufufiramer.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7023e6518b76449737751b5aad12a7b8/6776554505.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6fd613b2d---pixadulesigiwof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wow+shadowlands+cooking+leveling
    • 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_off00012b10.bin
79263093ff09861d393ebb9e6dfa6e578e132b571941b2948859866bcdaf7ca6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 10688 bytes
font_01_sfnt_off0001435a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1435A 16792 bytes
font_02_sfnt_off00015b6c.bin
bdc410915c55691229c020416fb3d9af829e0e6135dff3a12a1aecc6069b66d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6C 18104 bytes