Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a25f3e6f6ac73d6…

MALICIOUS

PDF

68.5 KB Created: 2021-09-04 08:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 489330d070de0889aeb867f45fd89871 SHA-1: b95c1bd395cd576d40681c6e9ed2863bd0bd0f0c SHA-256: 1a25f3e6f6ac73d6f7e46e01f2ba8506570274147d648cbaf015a415acf12fb1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded links pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6331e93438---kiwig.pdf
    • http://all4pets.cz/ckfinder/userfiles/files/86021992768.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16116de80d6c8f---tarufowirusefalani.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8c9b0716f8af9930da485c0aa9d253a4/83852794389.pdf
    • http://csc0512.com/userfiles/file/20210619210435_6pnyzn.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/37ad4f4214e077af29a0bd62bb74413e/lunuzamaran.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/blndnn8c8cncvdll7pjg4i9oua/ropavu.pdf
    • http://vattuxaydunghl.com/userfiles/file/20561628610.pdf
    • http://timandlor.com/userfiles/file/napadepuvabofeguves.pdf
    • http://posekatzahradu.cz/files/file/fopedewivavonaxok.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/44e807acb0ce83e4c82add0e9710ce9e/72727090186.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7sguutbc6rp96dkvr2oagbn572/waladiridufubusinileg.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ec482177f4dfcb56560557720ed198cf/wizajigukixojilutaxotew.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2i993q0nnt6mf8a2kc3mu5oo40/72702857145.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d754a9031---dakakepuweno.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/56950787356.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/tiwiporapewi.pdf
    • https://lengthening-sldf.com/userfiles/file/43036059745.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/50140342272.pdf
    • http://medical-1669.com/userfiles/files/80777624231.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/ripunalipakolanubaxixava.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f3828a754---vufuda.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5239bea62---50955542324.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16120e9da7bf60---xonugusovusut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=portotecnica+pressure+washer+manual
    • 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_off0000b175.bin
ac81a52fe9514df69273215f4e445d33d10adef5ae0178aa5bacff1033bd1693
pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 14052 bytes
font_01_sfnt_off0000d3f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 16792 bytes
font_02_sfnt_off0000ec0b.bin
60c55b393c8e2563b8da63ed36163a72253105561a583b9d355bf3926c5c7cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 10828 bytes