Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da38d349a2d7440…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 04:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d90f0a16bb651094e4be5849b89388b SHA-1: a286cbab07b3ca77cfe0bce44b2eeef05ddb542e SHA-256: 6da38d349a2d744099e3abde20c5e2f008aa154443b89fb91eca932998a2dc47
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cd7cb393d05861122eeee42a937fc491/bufixas.pdf
    • http://maydangson.com/vietkiendo/upload/file/93839588719.pdf
    • http://iglozawiercie.pl/zdjecia/file/33172995034.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca92d70e83---32947963208.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/i9bhuuvimbllc5ab1tebdtkt15/76010335262.pdf
    • http://apple888.vn/luutru/files/jegevorow.pdf
    • https://jackyrouxmethode.com/userfiles/file/luwumipojeterip.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/b6mlj7f4f1bgliv9ghn64r4hk5/muwaka.pdf
    • https://ludifrance.fr/userfiles/file/81042365097.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722ca9efe34---xudavabojumizor.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb72855a3---feban.pdf
    • http://cga82.com/admin/File/73230490339.pdf
    • https://ost-fogging.com/upload/files/26870361606.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/3urbeum39vvjioah2a3kth9401/53688296389.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9eb3af980---kuwiti.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7cb17b8a---11106200621.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee6359afb---vezoxatuz.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/1916ndfr8n6n6kqm01j6qcfc1m/61857736026.pdf
    • http://elitaliaweb.it/upload/file/99248184771.pdf
    • http://ccspevents.com/clients/24998/File/bixesowemugafezimajososam.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7501b6242---64026216298.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/mjoq8st7bv6odvoatkitms76mn/2527045494.pdf
    • http://ei-windykacja.pl/upload/file/masezebibuxapajotiladas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+you+set+up+screen+recording+on+iphone
    • 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_off0000e7b8.bin
f0181e327902b0c0e9153e8c477f238a46816b994eae5c91acce58728f871b17
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 10876 bytes
font_01_sfnt_off0001009d.bin
243f0853cd1acd8ab50c0447268f8eecd972edbff26809fcda264d6ded7248d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 17464 bytes
font_02_sfnt_off00012e50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 16792 bytes