Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92507d138b447dd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 14:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ee0a7348fd1cf2ec09a4f21029179d3 SHA-1: 4abc2b7e79832400c2a735baf3d01eeb34fc157d SHA-256: c92507d138b447dd1970b752efbbfc12a4b14ba965070cff4cef96229e849b6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically classified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://interreg-ipa-husrb.com/downloads/17158377871.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/kowalipabusepilewiba.pdf
    • https://hongming-eco.com/userfiles/file/guxoxij.pdf
    • http://vivatbacchus.hu/files/file/52815415416.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613912facd7ac---92451204599.pdf
    • https://0922.sproname.com/files/userfiles/files/romeji.pdf
    • http://docando.es/js/ckfinder/userfiles/files/40873412183.pdf
    • https://ifbscalidad.eus/files/galeria/files/jegilidufifodarojelapozo.pdf
    • http://studiogiamberardino.it/userfiles/files/81303036112.pdf
    • http://conhantaoankhanh.com/webroot/img/files/59183326512.pdf
    • http://4bx.pl/public/file/76098572708.pdf
    • http://residenzaeden-albisola.com/userfiles/files/nivazali.pdf
    • https://trainova.com/userfiles/file/figabimiditowabu.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ttkkg8p3mrtg76ba4dr942380h/sifegaxokodiwikidilakavo.pdf
    • http://wallbedsindia.com/uploads/wiguse.pdf
    • https://sofupingame.net/calisma2/files/uploads/11956921370.pdf
    • http://thepokewave.com/uploads/files/17083309342.pdf
    • http://forma8.kz/ckfinder/userfiles/files/vetobixikukekes.pdf
    • http://hifitness.hu/userfiles/file/lasikotanosefimurasixi.pdf
    • http://imobilestore.de/userfiles/file/75494407573.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331d9fd5b78---23731566015.pdf
    • https://elesud.it/img_pagine/file/53099691304.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+access+icloud+drive+from+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d987.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 16792 bytes
font_01_sfnt_off0000f19e.bin
3ce79c78934f0a6a5a8ea01b27bb50c0a158ad96ff1e67874644f2a1030438b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 10880 bytes
font_02_sfnt_off00010ac4.bin
d0404c0f098f1d68d1a105b01c4c33928828841b32e85b357c1fdcf22960d532
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 18188 bytes