Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fd85a48b5e433a…

MALICIOUS

PDF

88.1 KB Created: 2021-07-25 09:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96268809d3c654be094d70470a028701 SHA-1: 1144cc69416269e530c87ab22f21b2dfbd463bd7 SHA-256: 37fd85a48b5e433a03cb5a9e0e2cbf784db5b4c7c814625457bf5e6ca70e342b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://xn--m1age8bh.xn--p1ai/files/file/19917093520.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ntbs40a349v5sq2s8n8rtjo840/rifupixisejugub.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/92922859556.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a37c9264b2acfaa8cf0e6d702c0bdc31/milevotiton.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0e86c060e53c24f5a3c236639a030917/daralefifewatokar.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xowalatasugazug.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1b8dfdfe21225f44c1886b68dcce94ef/64553240552.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ece3a2cc6---nololavukexireputi.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/15813405343.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/fazodefopojope.pdfIn PDF document text
    • http://dalaichau.com/files/89107072537.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/71932631764.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/17e87973887b792b31b5c2b56d3e4f95/girekekolidemo.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/46874990471.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/seravevoxunap.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/bivasatojig.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7519ad7de---zewakapirutodanabi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cab6d2054bed9866b9fa5eda6a4df72b/surojolejamokoxada.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/b4l8pudviq65oeonvd9sv33776/kumegerezoresar.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f369633a336---53652396255.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/boraxova.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160fba18d2135f---27042764699.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/1300c0e89fbdbe19e4ffa3bc3b6b9fa4/majuz.pdfIn PDF document text
    • https://actorconseil.com/files/file/64111946455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=list+of+skills+and+abilities+for+resumePDF link annotation
    • 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_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 10804 bytes
SHA-256: 5cf44a365e2f86184cdd24bdd9878b75bd6fba5d45ba6a14c50047ec95b0cc62
font_01_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 16680 bytes
SHA-256: 1b38ab6d27cd9b31137216967d84dfa08f4c536c222f035d9ac92e7410760b04

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