Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f094c41a22b902…

MALICIOUS

PDF

96.0 KB Created: 2021-07-12 17:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f34ea9477c7165befa925a5d60b0106 SHA-1: f41712b7d37ce0b57cfef8fed06d149f0a857c1a SHA-256: 98f094c41a22b902d09b9304c5765cf6d15fc4df2360febad3e484631a068d99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, designed to redirect users to potentially compromised WordPress sites. The embedded URLs suggest an attempt to lead users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a891e550125---kitodumanonasiwo.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5647284d9---47169419829.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e85f5bddf8d757aaae2598a606cfbcf3/gikivebimorazamem.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/3fe40b719c61e991d42a8005a99494b1/60158211334.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/715d8a70161e9ed94173b1eadb5351b7/fipevifavibuvagixet.pdf
    • https://abofahed.com/userfiles/file/84012743922.pdf
    • http://austria-ex.com/images/blog//file/46075333305.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e233ed4a59---xeboganonijazu.pdf
    • http://digemnd.com/UserFiles/file/15961254254.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bca53bb1313---livowowo.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/sevolivoduropowune.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/h5qfs7ph5fmfg575jd1u356ch1/84481207542.pdf
    • http://rsst77.ru/upload/files/sotugi.pdf
    • https://new-baby.me/userfiles/file/9089123348.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608043cc9c344---10012798823.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4sh629ae8fu2cp8rumj4v9dno6/peweweruwekakukinar.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/284e84171482724ba6e586142a0f1752/redimarazilafe.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/gpm2d3suitm4lif3fjt750vvak/10069178506.pdf
    • http://maasmartcity.com/userfiles/file/zuroninigurebodi.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee055e4a87---80631777968.pdf
    • http://flyingcarpetclementines.com/userfiles/files/dokosopovadifumex.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/loreviz.pdf
    • https://homestayhoian.vn/uploads/image/files/5302576323.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/aeb2bd8d3ead13ea8318e1f7486cb628/tebalawimalagaduza.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/402831e5cd1f8e0922161f254dbec102/popuvupa.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/31800455442.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=affliction+meaning+in+bengali
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000dc64.bin
da9fb7d90e8973f6b8787b355adff2233126c637dc15a9242d79742025bc26b3
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDC64 16540 bytes
font_01_sfnt_off0000f34c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 16792 bytes
font_02_sfnt_off00010b63.bin
30abfadb12a4ffea97524a772a6988a0968969b305826b888f3d35069b6f0b55
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 10532 bytes
font_03_sfnt_off00012359.bin
5111f9d09f6f33b95dd846a63405dc544fe72ab58b8df2cccc248e86b1fd0420
pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 24708 bytes
font_04_sfnt_off00016365.bin
896f2dfbf16c6002c4fd24d3c226901f9812a13ca9b357f933c7e9db04bade84
pdf-font-stream PDF embedded font (sfnt) at offset 0x16365 3112 bytes