Malicious PDF — malware analysis report

Static analysis result for SHA-256 61eb7e072b056cdc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 00:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a54411b79eebe18d695d522771b136bc SHA-1: 8a785136b5dbf185b72e16279dee7b35210efefa SHA-256: 61eb7e072b056cdc5cbb66d29445121e6ad8a34b97770063413d2bb2969b0503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple external URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are typical of malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pjkconstruction.ca/images/file/23990954380.pdf In PDF document text
    • https://honghow.com/ckfinder/userfiles/files/kaxugawesinopozulegu.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/4918946318.pdfIn PDF document text
    • http://caramelitos.sk/files/50370450886.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/bea0db51cfb9af2e980b26c21eadc62e/4584250990.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4jl4an782q72q77afuhfgf8b75/72742396029.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/3022524779.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d5f8d72ab674ca679c2a1f2e22a82ac5/63095558060.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c120047ae---86653482314.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dchj72c432pl74bc295u9mmiuu/lelipisa.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/3ae27a02ad06b557a9394103189fc020/79256967803.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/wariz.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f70122d54af8d35f1bb84aa16bff7936/zevajolobegulelazin.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/marunamilirexebozewuweb.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107965a60fbe---19036340927.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gr2dnga3q2sebnvcnilouktouh/1870933988.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/42094565383.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6631fe50---35505464041.pdfIn PDF document text
    • http://kfbi.ru/content/file/51444694721.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0tb9uuselukk9s12poei1npl92/86350350469.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/xeboxugurukebidilono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sentences+using+idioms+in+englishPDF link annotation
    • 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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 18364 bytes
SHA-256: 4f9c5cf0dd6e4438091098f796e0c5e5cf18d5cf205c36d86b4a8785d536d27a
font_02_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 10732 bytes
SHA-256: 36590ff98a4095d0d85070c70a7b91e419d5306d46e48d5ad6f61610580ddf36

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