Malicious PDF — malware analysis report

Static analysis result for SHA-256 885cc54efacf8d10…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 22:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e99bf94a7004b45aa77ef7e2e9c08b8b SHA-1: 07580901605cb040990cd1bf1616da4d57c85755 SHA-256: 885cc54efacf8d10fa467d11ab5f5c08222aaf320c0dbeb930cdde7997088e63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=brothers+in+arms+3+mod+apk PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1933f2e07---83471724114.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/74115193888.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/nakononarufemowurajabejix.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/70162236397.pdfIn PDF document text
    • http://jinyezi.cn/upload/236659795.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140924dbba13---23209649182.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/85579186712.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/loniwununevulibiw.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/mibufefunobo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132780fea2bf---12636140958.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/pufegoletawifimisiwusudur.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dce9fcb07633ac0eb976e5954ae1f6d0/59132705203.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f1e054866fa896ec9ba721416f8ed306/vosixenilexudorojokiku.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/goxegobepexo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614298fabbb08---67599639034.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qcn436d48h1a02cqm3fabfunio/minuzirejokonojimebuje.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/40129885634.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/10195876722.pdfIn PDF document text
    • http://arsvet.ru/img/upload/54704292468.pdfIn PDF document text
    • http://mutitar.com/user_img/files/79350472065.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210902234940.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/nigilowanewupinivefa.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/wunizevubufifigokotogetap.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/29640039906.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/rufixalanekez.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_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 17064 bytes
SHA-256: a5eef29938c071258951062ecfcf9dfa9fada76e382f786e579ee452099daf61
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 10928 bytes
SHA-256: bb472d2183365f84d1aca81aa772a99ae93416b79af70701a998878cf437aea5
font_02_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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