Malicious PDF — malware analysis report

Static analysis result for SHA-256 192a4dd970897372…

MALICIOUS

PDF

68.9 KB Created: 2021-06-07 08:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 73dd76fca5d87dc8f2169576dfb61e57 SHA-1: c7fa9851cbb868cdbcaccfffeb3f20df1077bfc4 SHA-256: 192a4dd970897372cb3ce9c5ae6fa8ea5cc2e02cab2ac937cd32559f4e574381
156 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to external websites, disguised as a technical query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple URLs hosted on compromised WordPress sites and disposable domains suggests an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=why+is+my+ge+monogram+refrigerator+not+cooling PDF link annotation
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e274efcdc723f0a267a2f1b8cf8a67bf/neradejakexaromifexo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072f783b45d1---33989034338.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e7527f26---29851064024.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1dd21ecf7---kazuroluragevujodikemiwa.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a77c4a0a1---93072251836.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/42544599617.pdfIn PDF document text
    • http://kme-kme.cz/files/file/18360510316.pdfIn PDF document text
    • http://waypl.pl/upload/File/29115562384.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607b28338e26e---kaxebarojiwasilenedek.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f0812437e9bc1ae8f82ef3fd43fdb7a1/41755962238.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b811a87b9af---xekolagitapufolanunex.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/koboz.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/womitinuporarejidin.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/9hdjubbt54h7c6ukj34b3t7moi/mosezifatogulefoxig.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed5d97f78---sogewaj.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/difamasenazijageme.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_off0000d12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12A 5412 bytes
SHA-256: aebe07e442833070f5a338074c277700eaba7c364e0005494e55530a0d6e7858
font_01_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 10180 bytes
SHA-256: 8a9c8a0ac1c2a79e514adec90ef87d5f287eedc679a2cb33c4662fdaf080d26a