Malicious PDF — malware analysis report

Static analysis result for SHA-256 0128b3cac433557f…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 07:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 489f7719fcf437b69effc39696f5d28d SHA-1: ba472da72301be458b57ce6742a53d9969285762 SHA-256: 0128b3cac433557f8286cafd9a7c704b95fe535a09cbbc455d803156f3c159d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c5edf756---48336502710.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/lipawogusijugolo.pdfIn PDF document text
    • http://sparkpro.lv/content/file/duremulexisumuvujunuxibuf.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/zilelufanudokowuxugomixuw.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/96455088361.pdfIn PDF document text
    • https://agatanorek.com/files/file/samomiw.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/xijeviva.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9b7dd32693db2606de84b54e1da0556d/sinawalapubiligado.pdfIn PDF document text
    • https://kiptep.ru/file/zitovunez.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/12735845691.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c5ab80f3c66293e2c28d8702aec50023/zifokitikosurixotunejimo.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/56256003540.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/73417430378.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/99266652175.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44768ea09---42786943923.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/87058239342.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091091bb165c---52048862243.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bb85de28---28474693837.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b82f080b3---29642032301.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3sejf3ttmjledoquvkeq9i10n2/zuropotelaru.pdfIn PDF document text
    • http://dnepropress.net/files/file/letenudamug.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160712cc497558---42583559223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+parmesan+cheese+for+alfredo+saucePDF 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_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 10948 bytes
SHA-256: 6eae90d6c2e59efc9a5195d06fd6e17031badf6d6dfd2cfcfa4b22064e809abb
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 17984 bytes
SHA-256: 419708c6e35a53e9e696821e316418c0237bcee2e270c0036faf33a81f560b9d
font_02_sfnt_off000133f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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