Malicious PDF — malware analysis report

Static analysis result for SHA-256 250fa7403cad3d5b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 13:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06ccdc4a9a8484f58a7f4c8b77647b5e SHA-1: 5250ecac97876864399715b02cd8fb61e8f0eb82 SHA-256: 250fa7403cad3d5b6f5e67a256a69d3f3d6d29aa9740076f23e062bc7489a51f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=minecraft+tinkers+construct+how+to+get+cobalt PDF link annotation
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160940c2e35f19---fomaneroborezij.pdfIn PDF document text
    • http://minerva-collection.net/files/files/lonakebag.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/70156325700.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/16dd2e1d03e79e2a6a24c9e0e6681fa9/wimumerijiparoxegosukigoz.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///larozenugaga.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1ff2ef130bc4ce014ce7b200ebd29149/79566637029.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/365607ce2431a50ea06ecdabc6446b01/sexakovotafe.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vkpso1aqbjmgn1ffmeefsvgmo0/3704602031.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/91914824394.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wapozadazilexadogolikidi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6fbe921dc84c3ddc53aa0714254fafbb/garibegenegesigovigomeme.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/boxepaxoxoxijati.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/nezobidupirakelelop.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/52793442601.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85bcd43875---53396544095.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/kekajodas.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pghmdjd41ie2ltroutpc50f496/94442417629.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/86443805540.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/lipusobafejiriwosoje.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/17454897286.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/wunowumidegikomobos.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/7767487161.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9a2bf56a8c518373f5333290466ae33f/97474926640.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b85ebef4e---99613770102.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d26dc3fb5---buxixufijoku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 11028 bytes
SHA-256: 9bb3640340e1f62f8a06a559a4eb1393cdd20c4fd511d682d44433e054e3b944
font_01_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 18180 bytes
SHA-256: 7497ba08c1c4a40be036753ed897b591e60ac6849c74968ce5e4693df337c98b
font_02_sfnt_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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