Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38d4c243de445c2…

MALICIOUS

PDF

86.5 KB Created: 2021-07-22 09:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 246879ac179e173392372afbb5dbaf6a SHA-1: 38fabf3d9d4fda6b14c8df0a61bbe4dfea138ae5 SHA-256: e38d4c243de445c296aab98eb2b68c7b7e08ef1c8880de31bece7d847785c2f0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The presence of compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bmsorganica.com/userfiles/file/sovetikunabovusukurubaji.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/wefil.pdf
    • https://its-bulgaria.bg/files/file/62279983372.pdf
    • http://indigobaby.eu/upload/files/83762228200.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bd33e632---82670273258.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ac176e92ee558dcbb45ab89c5a3379ac/36577138079.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/94502512426.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790979e0498---zumelizeb.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f95ee19be618c6d7c346b16bbff180a4/14299600194.pdf
    • http://polloricowings.com/uploads/files/bezodegijunotafagawesi.pdf
    • https://activepymes.com/pub/file/59176569864.pdf
    • http://eyupsifalibitkiler.com/resimler/files/wusepevuvulerixof.pdf
    • http://abwessex.com/uploads/files/majaf.pdf
    • http://i-daa-wl.de/userfiles/sozokuguxox.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce2d09959e---48982499418.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/6bd07ec185f55c45c9bb7852f63d7d54/84826850938.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/b8kkcciddovrigdvna3fn3bsn3/manuzo.pdf
    • http://aqs-group.it/userfiles/files/2247713867.pdf
    • http://apvn.info/userfiles/file/62431790427.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab8f8b597---62706404439.pdf
    • https://drticket.ir/basefile/drtiketcom/files/67552213059.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/b8ftm4lnmpa261l7ggap7q6k90/wojew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=home+remedies+for+cold+and+sneezing
    • 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_off0000f082.bin
8be6338ecb53e04f83b464afcbec324578f734c8a237d13e796379b094a98ef7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10772 bytes
font_01_sfnt_off00010905.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 16792 bytes
font_02_sfnt_off00012117.bin
a04b12ab1d76565cabc7abf3f6a3382009aa4726d364d550dbe9fbf6319cb75d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 16424 bytes