Malicious PDF — malware analysis report

Static analysis result for SHA-256 7705bf578c85cf31…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 12:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cca30c26a73036cf42dfa3110b7ea281 SHA-1: 4e0ba93e216e5e317a0e8efa84fce63baa281aeb SHA-256: 7705bf578c85cf316ead20ca1bb2b4027a6f8ea134ba93695be34beb3c18d436
164 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of a 'ML_NYX_PDF_MALICIOUS' heuristic firing and ClamAV detection further supports its malicious nature. The document body is heavily obfuscated and unreadable, but the overall structure and URL findings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=jurassic+world+the+game+apk+obb PDF link annotation
    • http://airserbia2009.vs.rs/multimedia/file/62129733873.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/42920323904.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/85557883026.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/nunisodibefalimo.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/bilesawujikawipete.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/13462052687.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/15619876453.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/52356310009.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dfe9d3334---45703983531.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/73599156772.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613f92a1b5b32.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/f9d9e7a5effc637804a11b225928a25b.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/gegisuxepuzifava.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/lofipuvazide.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22223783646.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/nagipizexesuxuvuzepobejo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161309ac0f32cd---ruzivudefopavunozikon.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/70123109356.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/puwimivumegazobejevat.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/ginirirujagotunebeluku.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/90684dd2b8f6d5ddd84898f435c1db9e/75409768382.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/kibabu.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/89341703871.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/laxoki.pdfIn PDF document text
    • 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_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 11264 bytes
SHA-256: 47d5f3483b001825e2ac3a547c7501693e5bc2c07aaeb95abeb85f5ffd8f560a
font_01_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 18024 bytes
SHA-256: 752c5cb2a1c4b962f16ccc05fbc85c377eff12fda7486934adc2c6ffbf0da8f9
font_02_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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