Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ee312f3887a5d2…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 09:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34d70b3bccbd3c02a9740780b467066d SHA-1: 441af1d757de924661fbf91c9c86a365f8c1d164 SHA-256: 51ee312f3887a5d2788137aedf8ba78912e62987b20b94c9208cdf752ce9cf59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious, exhibiting characteristics of a phishing and trojan delivery attempt. It contains numerous links to compromised websites and disposable hosting, likely intended to host malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded URLs suggests an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=bankers+confidential+report+iba+format
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4e441c92c36b8aa5465d991b1c2ccc0a/diwegiwinobuwogezox.pdf
    • http://haohanlegend.com/Uploadfiles/files/liziluwubeva.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703dc72b94a---25885727636.pdf
    • http://jngf.cn/files/file/pawatogirapaletukop.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99781e291---zenifefojosume.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961778185fb---90068481670.pdf
    • https://skinrepublic.vn/webroot/img/files/41654708671.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f281a9562c---xuxijopagibebem.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b470e884207---40295630338.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/xeruvixatogadola.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/531b7fd3aab53ef24d6bf3a6d0c7067d/pisupomusitin.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad21cb4d27c---25997227412.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa15a24ae---85552198089.pdf
    • http://artecgroupservices.com/imagenes/file/55047068398.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f070c6e9---49743427101.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/jabafumalogax.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd24ab8d87---94045537571.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608744ffb751a---vuxomijatiguvuligek.pdf
    • https://dancleland.com/img/upload/file/7758915478.pdf
    • https://108pizza.pl/uploads/userfiles/files/43096731589.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/32367293563.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949353e2d4---17933314565.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25ff16bb8a---65773308052.pdf
    • http://norilskgu.ru/userfiles/file/54763591704.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4a1c994b---59393767700.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_off0000f539.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 16792 bytes
font_01_sfnt_off00010d4b.bin
e831bac1a701a770475ef6ce6b3a558d9194760453d6a875107c64f3a87d354c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 16228 bytes
font_02_sfnt_off00013708.bin
639ca7ee8dd02ff8e8dae2bc827d5884008350f94c8ae8d874a2e4707763f25f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13708 11064 bytes