Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1d22463a1a056a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-03 18:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 565f4f442fc8e4bc23ba8687a1569e42 SHA-1: b9ccc91bb8a0738dd89906cf011b3ad9fe3163f5 SHA-256: 6f1d22463a1a056a02292ad4a1993dea2c18dc5657998e014eeb6f38f4b36ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious sites or download further payloads, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=scabies+with+eczematization PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c549ec275a---75867469383.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2b11e438---riradiruxogazegape.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/072d070e0537338969de6b1971b96ccf/pujuga.pdfIn PDF document text
    • http://mosjob.ru/images/file/bemamavepokoponalig.pdfIn PDF document text
    • http://leton.pl/userfiles/file/tepixifowano.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e301bb3bee---11430627282.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4acca42b9a99b1a43a94b55dbb6337a4/sutowamafamatusetogim.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/lufalolu.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/poperogujuze.pdfIn PDF document text
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/54vhstu8363o2m1ifcpi8t8i39/xefokitimiwemo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ee610f89---bigopekev.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/51842776460.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/90798765788.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/63421343699.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/83710820491.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/rozozazadivuburu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b866d4470df---66194264249.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/warolokij.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7635f1f4ec---60257104684.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107031950.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/60329671310.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 10712 bytes
SHA-256: 428ad4ffaff521dc0c2334915ba87dd5482cb0a364570ae6ac4bbc03e3a6536f
font_01_sfnt_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 16996 bytes
SHA-256: 7a881aa645f175e94453877febc19049a7218c5a7fc13f322b3dacad2f36a6cb

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