Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ec868fa555c84d…

MALICIOUS

PDF

72.9 KB Created: 2021-07-01 21:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43486bf786c047711a59383560c50cba SHA-1: f82321b13d201086e7dbbf354912b557ba4d03c1 SHA-256: b9ec868fa555c84d3d90ceadc45a3f2438b92bda693b0296b85a2cbac8c690e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it is part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d5128db71d6---40136485984.pdf
    • http://czdashan.cn/uploadfile/file/2021050909343773499.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e23ecd2f---18980468258.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/31139416893.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2gr7ghdpm7pagfjuc8ojblt5n2/ketogo.pdf
    • http://www.77ice.com/upload/files/38361081293.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/91afcaa661be1769cafc62b80a948a5d/vasadagox.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/9100f4f982c2efa2e376499b4fbda1c3/92288780588.pdf
    • http://hitecds.com/userfiles/file/90330307957.pdf
    • https://personnelcle.com/userfiles/file/xaruxupivibobikebix.pdf
    • http://www.anjhimayath.com/upload/file/60198243235.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/tawofofewesalux.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4be077bc74---6297815874.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609453ddc0de1---53744475789.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3cdd06166b61b34b87d6ad4e286d8f76/88863851256.pdf
    • http://jtour.vn/userfiles/file/51442574584.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a121d0d4509---84496805507.pdf
    • https://mariellatriolo.it/public/file/94810229536.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1a31a4bef7a95782825936e329c090a7/zefawudexoselejuzexi.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf14d2e54e---renadugudi.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/a85da9143330f290ff0eba98ebdac6d6/98470890632.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+form+16a+pdf+converter+utility
    • 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_off0000b786.bin
27c81bdfc48d3400bd5a09f68145bb183b64027489a11cf9767442f6ee96c2be
pdf-font-stream PDF embedded font (sfnt) at offset 0xB786 11200 bytes
font_01_sfnt_off0000d1da.bin
233d9af753cbcfa46880fb0680eececd8e8a300d6be9896cb92f68a2027f120b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 16412 bytes
font_02_sfnt_off0000fcb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 16792 bytes