Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1d9cf3b20566fc…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 23:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f24a9e13ebc1a355389b75d76bf35ad SHA-1: 57a6cefbb7b68526166409269ddc423fdf2fb86a SHA-256: 0b1d9cf3b20566fc5409a54d6f9ff2319f2b00633038d4996dcf0904e3b2d260
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://adamlegal.com/userfiles/file/17884288673.pdf In PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/nl2gonj73pjs4nmn9o9dce6m51/59646662878.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/84153383124.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/gadakofezibumuwobugunoze.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hqsd8am2fh32jnehbop359rndo/jepekakabilebabalokasaf.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/45947847103.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/vigutamodudesi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b31703467b---69408343154.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/73422169562.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/35489892420.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/05756753910733c6aff90b38b403b266/subaxaremawoxesagomuruf.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/79243028740.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/467nhns9bv3ndl6lk5pnq1jk74/vaputofutubukejake.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01237a5b46---wasifobedoju.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/21154488477.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4d4bd62fd---netiga.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/94469650575.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/dovititivariwewazoluteb.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/masijitezofipofifozu.pdfIn PDF document text
    • https://medtek.vn/storage/file/66951343775.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/68582716218.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc308bc6b2---fujuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=easter+every+yearPDF 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_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 17460 bytes
SHA-256: b53e7376deb6c6631d062f18089e3f3f9c7080fa5617ddc62fee790d17650f1d
font_01_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 9904 bytes
SHA-256: 595943d9eac70af4e1e3b1ba2b7a36c4f76717a2f5c01d9756a7173204de0f3d
font_02_sfnt_off00013849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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