Malicious PDF — malware analysis report

Static analysis result for SHA-256 6762502d0c2460f3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 21:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 586548bf15c1843b4844186575ddb82a SHA-1: d3f8976aea0dfec0de293a6094497258ac6c7f26 SHA-256: 6762502d0c2460f33db65f623bcf6168be1585f805f61893c93df519c3374ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=honda+civic+2012+manual+olx+df PDF link annotation
    • http://tonwen.org/userfiles/file/sifevavimusexirerokaxigob.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/55353947987.pdfIn PDF document text
    • http://ewtch.com/upload/files/mobamefafomiju.pdfIn PDF document text
    • https://ghnservizi.com/file/60485228416.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/badolipajixuxalexijifuwi.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/51dd9bf2f0142e948136b72cb9c261eb/46008371846.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/21904412072.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161322a4bbfbb3---tobikor.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/gipefafux.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352fe0b353c---21329192415.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/7808183538.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/14114127300.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/tipopa.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/79969893820.pdfIn PDF document text
    • https://irantruck.ir/data/file/bepakelud.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/muminexifalili.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/dejoguwenef.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/23626913063.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/towewaritodadavumepezu.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/xunumokefo.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/xokimagenefina.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/mokomejo.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/jaxuximevinufururo.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_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 10692 bytes
SHA-256: 09a1ecc69ddbc165b857cd0fdb40601928647453dd555fabc6ceae6cf76e0669
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 16684 bytes
SHA-256: 2d1e24505651187e43606f7c9aff9a41d7de2e061bd0b144202eaf2385b48b81
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1