Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba6bb3ae28105d9…

MALICIOUS

PDF

98.8 KB Created: 2021-07-14 00:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 577e25ef327180f54d7c93c145b74977 SHA-1: ac60a86bb31d120a049375b838464953e649e11f SHA-256: 6ba6bb3ae28105d955e433fc7c2bb5aa8e83c9361ad73a3224acee21ca1873be
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=how+many+letters+in+english+language
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/61fdbba8fe36d9e0753b7236333fcae4/watijowexajitumigixofutav.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf864eef4---55378388077.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608816931337c---mibewunuvipotafakige.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e5fdc1a95---bowaxojar.pdf
    • http://baaningdoi.com/file_media/file_image/file/89538743215.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa247eec01---baseruro.pdf
    • http://artecgroupservices.com/imagenes/file/vuvofud.pdf
    • http://jshtextile.com/UserFiles/file///jisimebibinivetedibifom.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3d88c778---24489999428.pdf
    • http://akcjonariusz.com/UserFiles/file/wunenilumorulonu.pdf
    • http://sneedfamilyct.com/clients/44919/File/lesirobavifuvum.pdf
    • http://hphs1958reunion.com/clients/47465/File/gakik.pdf
    • http://tydafa.com/dafa/uploadfiles/20210608080913.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f6a33f05---64426312890.pdf
    • http://dom-2000.ru/ckfinder/userfiles/files/zosubam.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dfde1541bbe---tesizumefi.pdf
    • https://egca.fr/userfiles/file/fufodakavetemafitije.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c228e3553a0380db578d3ca5c880424f/letonerabogexefajumip.pdf
    • http://kaies.net/upfiles/file/37923666370.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a4561566fdbd7614f300f98541ba011d/falejogupifujujofovadud.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/34969127315.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9b6a9749fef979c1d9fcafaf202cb4de/kugagiti.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/sixeripavix.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acc59f64ac4---29373165544.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_off00011f8b.bin
34a512bb51c8499164873745de58a650917d68f2469bd5282a2754d01d3c6d6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 10848 bytes
font_01_sfnt_off00013865.bin
015c344584979b57333f114ad7a3f4ec84103ce2b7a3acb8e8c385ffd8ecb079
pdf-font-stream PDF embedded font (sfnt) at offset 0x13865 17364 bytes
font_02_sfnt_off00016591.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16591 16792 bytes