Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1ab1d3545b451d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 14:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38c20ffc3b2d9c540efcf272eee9b8e6 SHA-1: 0f3516529030382aa7f5e4a676c752fc613f90ed SHA-256: 2e1ab1d3545b451d959dc9095461713533a24805b23047b2a0ef7249c2991f2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=dispensador+de+agua+manual+easy PDF link annotation
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f33e351320---xiraxojukarebudagaxuju.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/jodixifololifenisiw.pdfIn PDF document text
    • http://safetypath.net/cms_images/kijedemutege.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/papakuxafupeton.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/5ab3a862769083bce800e2989aeb2817/xadisunuv.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d350c992652---46327379820.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/6503369000.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d45aa69fadf---7202705532.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/verubenavixabew.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b4i2rl3e9b4igi38pn3f9cnbv3/84416630417.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/kubil.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/lotaduvigovuner.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/baweruxuzabawulez.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d1eb8185ff9445bdac22438b0e75f8f8/51325598584.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/94882819909.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/3670611346.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/468rr6otpoub70k2204miuukt7/88501074636.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d1fd7d38b---lokemix.pdfIn PDF document text
    • http://cycling-software.com/files/file/13357032214.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/samiwesukibupebadexil.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608014ea87123---wokudoduzutonizore.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd51986ed1---roxarole.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_off0000c76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 10852 bytes
SHA-256: 2d581b2f8af35327b5443e0e9ffa2be4074fca7d471b32c414471a30f4d83069
font_01_sfnt_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 19200 bytes
SHA-256: 00bc1cd22e24c6e6d51c7f9fc91c6e04a365b0a8c95d2c4e915e71614f96c842
font_02_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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