Malicious PDF — malware analysis report

Static analysis result for SHA-256 d646ad05f4433264…

MALICIOUS

PDF

95.2 KB Created: 2021-08-08 08:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa7a16be102a16da7582ff6d4f0de826 SHA-1: fa621c58bf290032a9c61e3369f2027c672dd355 SHA-256: d646ad05f443326456f225dd350ec4bf24dd32090fdb6e02529139a78960aaf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4kgdukdab5932kt45k3bmh13i0/wurokul.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nbcs4lgj4ikfip61elefq0cref/punupofigumajatanolamu.pdf
    • http://www.blueoak.fr/image/file/xonawudoxo.pdf
    • http://www.alcera.ca/userfiles/file/nibitomekunig.pdf
    • https://goooinggroup.com/userfiles/files/20210619_085722.pdf
    • http://zerosquareonline.com/file/23999909879.pdf
    • http://aylincinarli.com/fckfiles/file/zinajaxubaxakiwode.pdf
    • https://agronlogistics.com/userfiles/files/zetafiramabupevefu.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072164dedc48---10757087323.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210625/file/16246389305678.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d613c9f206---21501687559.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mjlevjgkrnq4pvee6evgh8tngd/netabepuk.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ltfgi9r702ck1fr4i8hormjmhr/8232826550.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/josiseleniwi.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5380b4bda---38438306349.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1149ae526---30694172794.pdf
    • https://art-eria.pl/mandarynka/pliki/files/fozovuvajujatakanikid.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/cc203114d772d0c4f2bb931bfd3e5626/vogejafumodul.pdf
    • https://atlastoursntravels.com/userfiles/file/wamudopoludejujuwupu.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da932ebd6---70912195417.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/662f43554232af731e22433bce165f34/87682226087.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/cf8902e3c1a6ba9811854f9a7aba248b/1174819524.pdf
    • http://artdealer.vn/upload/fckimagesfile/5561273dc02c22cbe0bf6b0e345bc085.pdf
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/89171239398.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=capex+request+form+template+excel
    • 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_off00010ec6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 16792 bytes
font_01_sfnt_off000126dd.bin
a56884ef856b9c052a30a4b6eb84f6c9e86d7e83219d5c777099205e13b6ccd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x126DD 10824 bytes
font_02_sfnt_off00013ff4.bin
44a1b564b561f194f9a4493ed2687e79dc5c8500d8657be735feefcd7657f054
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF4 17476 bytes