Malicious PDF — malware analysis report

Static analysis result for SHA-256 1638a2ad608ad1e1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 13:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fab2c48541e947b5322f0dfbb288743 SHA-1: 6edb49bb69e9aadf43db66dce4b6f3dc89793cbe SHA-256: 1638a2ad608ad1e17079c5eba0fd913470670db27de9b3c311fb0e3a992fce7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=game+android+open+world+offline PDF link annotation
    • http://jrmhandling.nl/upload/file/64418704309.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5fa2b1a45---kojebinesibilotepu.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/26595110329.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/6740810842.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/slu0dok5eln6tbs3732dh6aub2/23565331727.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/62400777141.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63477321840.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1b92251c2d174e492db5b671b49683c2/fapawadezoninime.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a15859b6c---tibanitojavelogagomov.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/62417720717.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613972291bc66---fuluz.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/34796694645.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613904b8a5b7c---11828551465.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/mavutupulovabekew.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb75fe6f26---dofolagum.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/7516408281.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/negurudefad.pdfIn PDF document text
    • http://deforma.it/userfiles/files/32939239885.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/861088584.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/wexizubowederivunado.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/gepirodilobema.pdfIn PDF document text
    • http://crc.creativechange.net/ckfinder/userfiles/files/zorugivizabebuxatuta.pdfIn PDF document text
    • http://lactopad.com/uploads/files/69123814680.pdfIn PDF document text
    • https://webmenuplus.com/images/file/kusowuzoru.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613808f44f986---sijaborudoj.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_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 10516 bytes
SHA-256: 3667f56542a4b1608870498b8c2a305c82c7df40ecde770d67c4f8545281020a
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 17356 bytes
SHA-256: 325b9430ea8e4ee5bba39ce99880132347a542479b8d127a055d9f746f98ce07
font_02_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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