Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ba2e1ceaf3e694…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 15:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2d886ade913ee555e0bfe296788a0bf1 SHA-1: cd37e3deebcdede3b9cf648e2ed352d067ee9b52 SHA-256: d5ba2e1ceaf3e6949bb76df4331b27f3805af2d12c00f99ec9b4532f36eb8caf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites or disposable domains, designed to redirect users to external sites. The presence of 'utm_term' parameters suggests a phishing or scamming campaign. ClamAV and ML classifiers confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=zombie+frontier+2+survive+mod+apk PDF link annotation
    • http://amdind.com/userfiles/file/vuzosomed.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5ee233960---66653985718.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/63357605030.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/fedasizodosufamokesixoz.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/xoxaje.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/65287733092.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/62686487946.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/jetorewefejifi.pdfIn PDF document text
    • http://ipllaser.in/uploads/lojeg.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/sajewesuv.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/82709735877.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/69524310139.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/865a93e1c129d4c5421c9f297810eac8/kanebomimijafoloreliwoxar.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/xulewupaz.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/wilunukonebarir.pdfIn PDF document text
    • https://pacificengineering.co/imagenes_cont/sitio/documentos/40465809658.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/de61fcc897e33cffb30d6d18abd424dd/27955394558.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/piwatopidelunuj.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/bufumuli.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/riwufoxizudefeterijipek.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/zijikamanekef.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/sufaguzoxugatutatovalit.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_off0000ac71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC71 11096 bytes
SHA-256: 9d6dd57e9e604b00fbe20395ce36f74d390081d6a9114baa783a16f4c951e942
font_01_sfnt_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 14812 bytes
SHA-256: 5a0655e0882a2a880df3b851e01fce881e4d9815070f8b7b12339b605a91db5a
font_02_sfnt_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1