Malicious PDF — malware analysis report

Static analysis result for SHA-256 4434c2464056c4ca…

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 10:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f51a11290534beff63ff14f6d300f06 SHA-1: af00e6bdd5c387908e6b2b91466f6f78b3c78ef6 SHA-256: 4434c2464056c4ca3e77895da9b8dbfd1a3853a67f2bec2292e864dc828a37a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various websites, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the structure itself is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://philabc.ru/uplcv?utm_term=genshin+impact+promo+code+july+2021 PDF link annotation
    • http://kursadowicz.pl/Upload/file/tinakobuzesuxelaramib.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/baxazuvanozozirum.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/83430573434.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/kukamivire.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/zorok.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/revivobije.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/wuxilefadukivoseweripigu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2dbbbfba8---birasipunivimunap.pdfIn PDF document text
    • http://zkpower.net/upload/files/torowugumufofuzif.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///58803105658.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/kewokafurevoxemanati.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/natumokiwag.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/sukapedutowimoravijiki.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/17169670280.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/30924971714.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/vudemepa.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/gujetozavi.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/mafubepogemusavegunogu.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/12220857420.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613335a486ff0---25828007556.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/jobumukawepudekevifozukej.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/98491029073.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161305d6c14e28---61914820888.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/52198207418.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/rigevupowawitimog.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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 15876 bytes
SHA-256: 511666caa55ca6e68ecc98f7ad0d2ab35c4ff00fc491dbbae2c9f666c56655d9
font_02_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 11456 bytes
SHA-256: 5f9810f4b50784acc0b889822791d8dd0862ef9ec92d1392dc02212f2087d26c

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