Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fa2e37e412ea5b…

MALICIOUS

PDF

98.5 KB Created: 2021-07-07 20:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0427fccf8026f70dc0d7524706887169 SHA-1: 4a21288ab3dbbf4d8ee308a742eafe364ba99110 SHA-256: 13fa2e37e412ea5b3b9f0d853a42f3f792ec811c2157a8afefb8f39b14e5d557
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 domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://kunjipsc.com/uploads/files/76566632642.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84312624b---tagitafeki.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e3276ef6f---warijap.pdf
    • http://alituncer.com/userfiles/file/5519231171.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/m2t6soi8mct93r5f8des7uekh6/36179802805.pdf
    • http://szao-spb.ru/images/news/file/bilikaj.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6940e30d---71093171874.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8dcf89bc9---89022148903.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b246177dee8---68788074038.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/si7g8n5be6jf2nta9uh6jjfecn/dikotoguxejilut.pdf
    • http://animalscipublisher.com/files/upfiles/file/73315933992.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a8032312a9---niwamej.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c449e3e9784---fopomibepanubu.pdf
    • http://adaviestransportltd.com/userfiles/file/filarolomoga.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o24jkgihu095kjk49afgb4us55/nararosalewaz.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/g15gutosbcbfhrinjknp4rfia0/73808377795.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3884ae7176---retuwopume.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9d03a6dbb364fbad20e1fa3c00a0138d/bebewibatusupetepo.pdf
    • https://777mto.org/contents//files/sudenu.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7011e08dd---79523358384.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/sg67es463578hhm9i7mc0qrv27/5373720091.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02c8c9a5d---18350571685.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c71525c6933---fusakorenejexunoxolo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=high+protein+meal+ideas
    • 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_off00011df6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 16792 bytes
font_01_sfnt_off00013608.bin
8d338ab3519dfbd009335a727fed1f288e63a1a7e26ca6ed597816b258fa0711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13608 17316 bytes
font_02_sfnt_off0001630e.bin
0152a58e92038eaaba73e5f12cce27aeb5de4b9113968700e1ca3eb707a52c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1630E 10828 bytes

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