Malicious PDF — malware analysis report

Static analysis result for SHA-256 965044685df009f9…

MALICIOUS

PDF

87.5 KB Created: 2021-06-14 22:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 43d3280078f21ca0d43077d5e8c2b80a SHA-1: de230a1381ca4388d0adfac6984089bc58d25996 SHA-256: 965044685df009f9fd638ebfd78fc7db0c8b2623f2fe634945bcc4ea0bbce2b2
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 0.9997

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://inwebjor.ru/uplcv?utm_term=warframe+veiled+kitgun+riven+price PDF link annotation
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a66bdb0fded---18046747751.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/93884712470.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/juxunenelozisik.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/17764959037.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/53843376224.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/vigekitefolafez.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/38233919733.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/tumuwidazaguposuremezebub.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160984f592dc37---wofojilimedevuvizuwor.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zimijazo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ac3e1d8b2b0bc2e7f1dac5824c210822/jobikesoduzukej.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fdf94ce1---36173254123.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/29415b35eaa2e3a8e11507d5759493a2/kezexinemozisevudibupexi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/85005400714.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/422bfd448d4ac0ca585cd532483a79b4/92634825316.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/52962936725.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087de19c2cb5---15764900748.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 2952 bytes
SHA-256: 4a44a03091a097aba5daeb64a762601ff8ba61d90ca8a4ec794a4c9dc352adbf
font_01_sfnt_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 5432 bytes
SHA-256: 030f9f515ca5b83a8b8849844060ce1f978e6269919cee1b4aa172e4747576d3
font_02_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 14928 bytes
SHA-256: 8eedd59808cda0d937f54810ee94d2f6a9fa9dba2c2f62170b608c7e8f9d3db8