Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe3e19b58ed71d9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 19:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1808ecd022174bcc08b55b1547c318fa SHA-1: 9de252bb8cc9e7dc77adceccee41cae8bc94dc04 SHA-256: 1fe3e19b58ed71d91ee5231cfcbbfbf729d267fbc21a2175ba16224715cd26b4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to external resources. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://corpusbg.com/files/fck/file/norifunukipubodetigow.pdf In PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/fc46d613d2e0a5662a24d25ed1910b14/67178541134.pdfIn PDF document text
    • http://rafaelokazakov.com/file/38748092631.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/zuwoxeta.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788643b7b87---niridikiwij.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/32402957662.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/82142048728.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/xavikajebilakakazulateti.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/37241748172.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/13213362165.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/48723885825.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c109a00c7---degexamibukabawatoda.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/29809339432.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/niwogasutokozoxuga.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///fulebepazub.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pisotubeduwababu.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/wamol.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a0194c78051c5bf2d377441abbdabb4/36974901566.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/tomiduwitutew.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/solewugirizaza.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e16e3be25e---xomosetikiwomikipuma.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/77275181370.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/lujoke.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/29280778358.pdfIn PDF document text
    • http://17njl.com/userfiles/files/39132423236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=for+the+lord+god+almighty+reigns+chordsPDF 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_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 17924 bytes
SHA-256: 9c09959557033bfd18c34bff6e946a67ed6ad8c7791872c977ec25496a55d557
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 10908 bytes
SHA-256: 47cdc442a476508add9492340d2814cbee8119c6f280e2f14614defbc59759ae