Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbacd1aa9f12812d…

MALICIOUS

PDF

72.8 KB Created: 2021-06-17 10:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5d1ce6c580c1206d1d7a2573fe42c3b1 SHA-1: d75d76f652f4e136d9ab031f0a59214c299fb726 SHA-256: cbacd1aa9f12812d4f263289adc378762aac2585f9de70ede26d71b39a98e875
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://krisoc.ru/uplcv?utm_term=minecraft+exploit+client PDF link annotation
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c900c39ac85---baberarag.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8448ab8f65b7aeaaf250b8cf46f0790b/79897734509.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47664356043.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef5dbcdda1---24433299597.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/dn630fj6tpabnhiesr1rccbs96/93639435708.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ss25ol04l7fno6j9dvhrvnr8ts/kododitafatukomi.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/87824056259.pdfIn PDF document text
    • http://rybczewice.pl/userfiles/file/12237291531.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/72655358237.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/81445773625.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/19809245297.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21e273f74---83672733035.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070f2111aa23---vabojosotujuzik.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/kuwamopuwin.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/nilizawixovijojojafes.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/tofetekirirexesedeweno.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/29472529099.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 4904 bytes
SHA-256: ea555928a525d7cb0b57e5fb7cdb3a77cc238b157ad68d2771094e9fe85657a7
font_01_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 10744 bytes
SHA-256: 217925bf48d4c9d2030e52f39345da7078475acf5564dcb88f23d8ed15e72b3e

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