Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3a7df74fb88ee8…

MALICIOUS

PDF

82.9 KB Created: 2021-06-29 11:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c086caf1328b9ed8866cea7df70195a3 SHA-1: 535edbd11da6a547a29eb9f3298c952e1b7ed9fb SHA-256: 3e3a7df74fb88ee81af03da060209e071803b29fa40ffa7ea6d880a4b61aa231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff6b91528---xelowarebokikezuvuzawalob.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a45c46b3734---19126443503.pdf
    • http://yule-sign.com/upload/editor/file/20210529235132.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e0050239---24010593196.pdf
    • https://lawina-radom.pl/files/file/67740006975.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f8050f043fd70296956eb9e8d51f1b8b/rugukebaw.pdf
    • http://falerisztika.hu/tmp/fetibagajelufup.pdf
    • http://cuuhoatudong.com/upload/files/levimurusinak.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f71fa36e27b2efd605e47d371fdecdee/27311196076.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/1947db92a4b944faa869b505531e2380/79499307905.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2973c599b3600f73a4b4a091ee189f9f/43354439850.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/90090327843.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be79de86fc1---rokite.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gci60na650hhh429op9boec0q5/jovaro.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ba97ae295e73ff84061a712aabfcaa86/minorej.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f00003cf642991bde45900cd5d0dbdc9/vajorerajelojulumoke.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/27dc08088827cc806a55d793ebf62d86/1886778290.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607405088ef32---bexet.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/okg5gkj9th5dcor6agtr6tfmo5/gilugama.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0b02cd31339d6f13fd0cc113eb2df33c/68321588486.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607761acb1ecd---50048092723.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qk4iutfa1a0trobropbm8s6ch7/43088699579.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=comprehension+passages+for+grade+3+with+questions+and+answers
    • 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_off0000dda7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 16792 bytes
font_01_sfnt_off0000f5be.bin
0970995d70191f3bb1c4825f386defe904033238b2dbcabb82ecd631dfb4daae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 11432 bytes
font_02_sfnt_off00011027.bin
f528b0f781d6751d89d36eadab78d8a486134b009348f0e48c8f95a35fe38a03
pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 16852 bytes