Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8004935657f239…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 11:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75ae51b3677c5d269f452cf5acdb86ce SHA-1: b28268d87715ff5eb5901cc82e3d8b2f9bebd942 SHA-256: ff8004935657f2392c41db103ecd02217b138392dfcb2afd88db9f1fd99d6113
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure suggests it's designed to lure users into clicking links that lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://shinies.ru/img/lib/file/27614173793.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ea53149ff24362aad0622a943a35d859/18723938746.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/zetiwe.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/e1un7pi8vt2fr3apqos528a4p6/75786549011.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9bc2a864efcb64b6a3093305207b3465/59560226327.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/81306476336.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/67668821932.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37664173474.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/ridegekoradoxizoj.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/kojafalazofavukodifewarig.pdfIn PDF document text
    • http://519pf.com/userfiles/files/gelipituzu.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/68458223598.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/rezubajubor.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/xefaxirisodubogilufo.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/20335715576.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/zegixerigebonarif.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3b0ebd0e---66787984159.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e5ac0009---voragutufapewufojoxafi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d2946c9e---vawogeteneni.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/lomebakebiwe.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/74091369ab43b61236eacbe8dc720837/80151027473.pdfIn PDF document text
    • https://badoza.net/userfiles/file/garasulibigilibiwodulilul.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/dfd34b463df923342185698a2c45945c/52948529554.pdfIn PDF document text
    • https://room12shio4.com/contents//files/60218798017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=exercices+fran%C3%A7ais+accord+du+participe+pass%C3%A9+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 11104 bytes
SHA-256: c456d9d031953e94f994b16ccba6e49b8dd94ca365b019d1e5f29eb1ae31da11
font_02_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 20540 bytes
SHA-256: 6d35b22b2f069b1006fab0cd7a13189c820848e6ed9a087d4dec63eafc5fc5c2

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