Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a917c3654d0473…

MALICIOUS

PDF

86.7 KB Created: 2021-07-15 09:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0427f975a738d19f04f4d22de22d04b5 SHA-1: ff029b1ef3ea7ba01bb3f3f49fc1a647a4812b95 SHA-256: 12a917c3654d047354785e74e8ce95393ff88b3c2eacf206ddff24a7aa07aafd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malware or conduct phishing. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic findings strongly suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/jeeeek43uvmfm8a77n440lt0t7/14168632351.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/54464737424.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/da6fa51c1108acd24d2af4e33c91a3ea/mapujosafitu.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/nalosafogowe.pdf
    • https://btsis.com/upload/ckfinder/files/46281539574.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d8f00548---visesolorugevajepum.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e36c6265---58548592054.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db33dce9457---92269482701.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607148f0ef920---1909942216.pdf
    • https://filetorme.com/upload/files/nadoxutijuzasamujusuluri.pdf
    • http://hzjksj.com/images/upload/File/89474129062.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6bedb29a1---motolaradawogosogexezibes.pdf
    • http://nsfeed.com/_UploadFile/Images/file/3970588917.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7bcc5895f---60244311893.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5e8313c0372702519cc966740bd59c0b/rugusa.pdf
    • http://foto-klub.dk/userfiles/file/21227118102.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5b7edb4690539180f94854882be0c899/gubofivikedakano.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e50f2905---55598999643.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49eabd33c---dokalerewulokewuvo.pdf
    • http://veterina-hrib.cz/user-uploads/files/97919512063.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/76150e736b48e93e7d592e37a85cec51/44506134531.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf71e5d10---44067453742.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd607eef1---vogej.pdf
    • http://asckhn.com/acskhn/userfiles/file/9502551589.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662d3bcfa2---5075283851.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=planting+daffodils+in+february
    • 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_off0000f162.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 16792 bytes
font_01_sfnt_off00010974.bin
86cff9f9e0f459d0d9ffcb9c249b8ed6925b6abe78f6d8c933a699a15d35fdf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 16532 bytes
font_02_sfnt_off00013477.bin
ce435f01b55481df9360797cfdebfe090b33dc1ff574d8412d96b856e65b708b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 10884 bytes