Malicious PDF — malware analysis report

Static analysis result for SHA-256 074b103d8e677ff6…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 03:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de3d0b96d3a28da106354443ec446462 SHA-1: 86de3cfe25ce14b0c66c1023d7e9ed60e368fafa SHA-256: 074b103d8e677ff6c3f9f73fdae4eb8e66e9ee3dd4a94220391338c12f130dbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and appears to be non-readable content, further suggesting a malicious payload rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/38675021157.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4232bd7f877ac9e61e8bae80f8f8e7ec/giziduwikosujixadetolaw.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608561f2aa2c0---64088360000.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e89afb9aa5477c329a835618399434cf/40063528554.pdf
    • https://smgbid.com/ckfinder_userfiles/files/misinodisoterajuzil.pdf
    • http://clinicaveterinariacene.com/userfiles/files/6641456884.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/64551398bf8c34391d81f20b1ac12ecf/xezovujuzerava.pdf
    • http://reklama-kemerovo.ru/files/files/69455801494.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4dgmsr32268l72l5qgj0kqlv92/woruronukikusa.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b746f74128---24294199403.pdf
    • https://dnsbp.com/all4help/fckuserfiles/file/29149878685.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6ef00169---mexabofo.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607756fca7513---dodopove.pdf
    • https://stopserv.ru/files/file/10255737785.pdf
    • https://cleaner.pl/userfiles/file/webesirajige.pdf
    • https://everestart.com/images/stories/file/86265896807.pdf
    • http://duquenne-moteurs.fr/webroot/upload/files/41257252823.pdf
    • http://babyshelter.net/assets/upload/files/6210352411.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a194ab03f10---4821164149.pdf
    • http://shangrilatheshow.com/ckfinder/userfiles/files/77456964524.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5655f9f477---49325446396.pdf
    • http://jnnycc.org/userfiles/file/petuwegexegekuga.pdf
    • https://ykitraders.com/UserFiles/file/ruvuwosinazamum.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18d9304d9---webotikiwa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=magnesium+carbonate+msds+pdf
    • 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_off0000f04d.bin
3892671c60aeb09eec1a91cb4716e8eaf0e924b3d6ac6eb2904cd2f64a8a56d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 17444 bytes
font_01_sfnt_off00011d32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16792 bytes
font_02_sfnt_off00013549.bin
13bbedc296b5764bfddc85f4bf74e00a918ded9df4bb1ff7baef32176ca3a854
pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 11148 bytes