Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dc684d5e997c86…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 22:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cb691df7b9b757e503dd068bf0b0005 SHA-1: 2933fd969da5cf5d9b8ba6bad064579781eda5df SHA-256: 92dc684d5e997c863ed17fe7c314742c7027f64229badb248e8000b226f4e592
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting malicious files. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech support scams. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving a callback phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea93c35769---kifoxar.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/99523791b606ee226e51b46eef80a28f/puvaj.pdfIn PDF document text
    • https://iword.de/userfiles/file/46846437211.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c603770bf641f04387e3a92ac91ccc89/duwuzug.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2e4fadccc229f53a9a46befb2229d014/pujexewusokegix.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/36253623832.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/ledogawirugudubavoruseno.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622908059.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/97122583440.pdfIn PDF document text
    • https://bselink.com/userfiles/file/daravipinoxijamabug.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/79746716970.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/ropezevi.pdfIn PDF document text
    • http://ilkemymm.com/image/files/51157733774.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26695391918.pdfIn PDF document text
    • http://airsoft1.ro/files/file/35598168482.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/67765122624.pdfIn PDF document text
    • http://brukbet.com/user_images/file/48705124658.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cce58fc1a---21926144526.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cec78a756---44552673482.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/39976777056.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/lujiwadatagetuwe.pdfIn PDF document text
    • https://fuoriscena.eu/file/21438904257.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/74757562062.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7fce680533e1018079b278969faae036/30638408731.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b05fb5efb2---82202013372.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf6d3f147---45536950838.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/mobozojatamaxegufirawa.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2ee2f0424e745f830cd3fd478d9eb373/nofodulugun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=30+day+workout+challenge+pdfPDF 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_off0000c246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC246 17424 bytes
SHA-256: 76702ae5320761a731d3955c5617526b216d10ceb37e47ca67bbb9eaaf427ac1
font_01_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11228 bytes
SHA-256: ddcb287a85dbebcdb5fd626c0d3b6839780d52f2aa7a760ddcba311dcdadfaa1

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