Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bea49512edf69f0…

MALICIOUS

PDF

70.5 KB Created: 2021-06-13 10:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6ad2c4124e662bda049c88b3edac8a27 SHA-1: 8330479cabe149fc4b462044bf3445fecd8271f0 SHA-256: 3bea49512edf69f0fc158fada4c10f20905ef7a29fedef3125f30bf606db8879
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malware. One prominent URL, 'https://allytemp.ru/uplcv?utm_term=guitar+tuna+pro+apk+download', indicates a lure for downloading software. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=guitar+tuna+pro+apk+download PDF link annotation
    • http://coinproject.com/userfiles/image/file/55345344843.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/63342869449.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e369f0088040460ad3ddca5705e95549/worovakodufolo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n16t9ibgghp8a0in97fo5d25i6/35292686542.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/rugemajisolawinezop.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/miwavovoxitawonosorosuvo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae0a590df---mebipoveburukekunub.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ugej1m50gq4p2s6ic72hgq1to8/5091474507.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b0f03613---wofewuwerudomatu.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/48504001445.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97c5ba793---sozijenugavegalejawosoni.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798f4366cb5---55027831157.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/kesirov.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/58142340650.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d8bbc75d34b73ddfedfed76e3a1b142f/nalivazefolejovumogepan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 4960 bytes
SHA-256: 8e10ec72ede98cc3004a2162a25ab99288077af8140442cd4dc849dcf2d0184e
font_01_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 12004 bytes
SHA-256: bc7b55250538b4e0a45d9a89dd5a31f11e9e205e937f74f5d1544dcf9cd1e6e4