Malicious PDF — malware analysis report

Static analysis result for SHA-256 607f942e39a29189…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 19:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fbea7f0727b5148cececf3cf1710778 SHA-1: 12eba95cef8059739929cc40696e08bb07e6d168 SHA-256: 607f942e39a2918996823f96b3dc6ef20dc4a4b7bc4815b1c3e1bbee89a2e2f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or 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 distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=the+knot+of+love
    • http://nanobubblevietnam.com/uploads/userfiles/file/10598615758.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786b110a78---23880044165.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0687d3ae60f7c1eee39f45608902e370/95241248908.pdf
    • http://ingenermarket.ru/userfiles/56282828432.pdf
    • https://luminex.pl/upload/file/73628017217.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/74dcb45bd0ad2384bc1a32ed2afc3879/1243576740.pdf
    • http://101-games.ru/images/uploads/files/24870461189.pdf
    • http://doo-san.com/userfiles/file/20210513162915.pdf
    • https://aduanaldelvalle.com/userfiles/file/12474488924.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/af17ac1701770d7560e228664f94752e/97917802235.pdf
    • http://csptech.net/admin/userfiles/file/pevirufasawuno.pdf
    • http://yjsyrj.com/userfiles/file/9452430707.pdf
    • https://thegioibaobicarton.com/Images_upload/files/pebusuwakexetimebupo.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4701f2747af17c20be2da1b161a85fa3/lepunoxuvuzesekoxowanibo.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a6928b778bafd1c6063c3442350cb7d9/46213831010.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/0memm1ua7370f0j3dd85tvhrjg/75706368416.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/8g5espsvfikdvjjh973hubj4kp/68170634630.pdf
    • http://aaaexpressac.com/userfiles/file/zapitoroboronoz.pdf
    • https://secolink.sk/userfiles/file/98665707191.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36ca554497---7386306198.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_off0000e1cb.bin
a452ba728ecbde1edb95e0ee234e997fa7e9ac190cb96d4616099bc2ce91843d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 9912 bytes
font_01_sfnt_off0000f7a5.bin
d8efe03bc110445a0e308fa13af9ff8bf0b9d1fd3ce03658a14c082a4c81d311
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 29036 bytes
font_02_sfnt_off000130eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 16792 bytes