Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a0fbb038494508…

MALICIOUS

PDF

77.3 KB Created: 2021-08-21 21:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df6256e1a82d5b8d482a8634739ab384 SHA-1: b5b429055c349925246e5d2c219b02887241fcd1 SHA-256: 55a0fbb038494508b78f65303ae4940bcbef929471a94fdf7c0e72e247557e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=spreadsheets+for+mbbr+process+design+calculations+pdf PDF link annotation
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469cc4bc7b---3759041510.pdfIn PDF document text
    • http://abpaluso.com/upload/file/39377878093.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/712ac0d343db2b40a24da7bb96d03e12/88426481088.pdfIn PDF document text
    • http://www.buildonhope.org/file/11450901489.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd6dfdd3cc---50025948815.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/mujojipidasag.pdfIn PDF document text
    • https://alutat.com/data/file/11366868744.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/datebizarevirug.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/nidakeve.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9ju70h9eqde7181o2d81i5ruse/zunusefowovogutekexob.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/954uumslsvb4ec0o5k7i1va714/damipum.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/kibevetidofimugitoxoveka.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10c0ab59a5---19561831594.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f73951cce9e---12321755265.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/sakufazilefuxuruwodig.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/deliw.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/divekeritef.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/vuruvotaj.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b71fd38bc---nulatax.pdfIn PDF document text
    • https://norservis.cz/files/files/55076736900.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/45791238914.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e25208aac---vikimani.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b56afaf07f8---fajedawipexuwokezimot.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_off0000c8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F5 11380 bytes
SHA-256: 43659aab0feb610187528b87c6ce0b6f7afb566b3c14649f9b36b453c3e2e5ef
font_01_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 16476 bytes
SHA-256: e09ec04c30fb011fb2f39a26d76953098f7eeb0fd7715f0d7513b6ef6cf7797c
font_02_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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