Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b0f056501d14f4…

MALICIOUS

PDF

117.2 KB Created: 2021-07-01 20:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b09e7bee6328a7cacef40c9920de790 SHA-1: f4ebe564f5bcb225f00b872593b17c0356b3a8ac SHA-256: 54b0f056501d14f4070ddad51a18e79036f763d28ed7ba50afb226f9dc5bcdfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://pistant.ru/uplcv?utm_term=convert+pdf+to+ofx+online PDF link annotation
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b3dc1fa334c542596c999536860f7c6/pumurazinotu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/42314719936.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/41214908422.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b611fb5326df1a5c041f61cfe41a2368/66098838685.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/viseje.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/9vjlr171qprguh5b4mke6l76u5/5884387665.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbea850e18---76818094288.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dbd40409f1f91e1f0fb04fd728b02a2c/vulutogotubowifobewuw.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/957a75e3a168fc2a0309492d978f131f/gisajifipagutevujes.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160928fd2aabc8---93836594160.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608404cba34fd---kavemasodozometar.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f92abc5ab5eb9aef00dcec8030e42435/lejeruf.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/lotisibivugono.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082687c4057d---66960014287.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/tivotixosipo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e722d5894cf2aebcb0500d86b0886786/92061361020.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/kanizipojafizaju.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793943aa7b3---11893665190.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/80416490994.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/33902402402.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc9ca0b91---92771702411.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/358e30bdb0850a20b51db931310b73b1/fazukakidagemijofarijivo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 26780 bytes
SHA-256: 231a5413253915799349b8de75f79dec69c40dfa92d2f7a47b30a807ff08f2b8
font_01_sfnt_off0001454b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D59 28560 bytes
SHA-256: 59574eb3dc9532da71997a8c75d158036c8cb8a82c194abce4a085a616cf5c71
font_03_sfnt_off0001af7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF7A 10360 bytes
SHA-256: fdb5c6cf3a8e3feb04c84022621b1b7b2d4ea726987e528b110e15f30019f235

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