Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb52151a2f240dac…

MALICIOUS

PDF

67.8 KB Created: 2021-09-23 16:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 641eb12b45d57c2bcf331db59260e093 SHA-1: 8060ebe4f7273248ee9afe21042e16acb6a74875 SHA-256: fb52151a2f240dac6e9c732766fdc1767f32a0973f8dbcafd915fd6736e483fa
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links, including those on disposable hosting and compromised WordPress sites, points to an effort to obscure the ultimate destination or leverage malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://funkyspa.net/ckfinder/userfiles/files/zupusedepe.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140dbf7e24e8---votuzobuzap.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea510acec---goloxuzesafi.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/77826507762.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hsk0f2bodapkh4l3o186q58r61/88240795477.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/memijijepamikudof.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/karopefurujanirexaf.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109110150127815.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/gelepogupopepolevawuximaw.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b0ef9b097d49386e2ae2c1d3a365c0f6/duligojozuton.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/94777617196.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/lepedutegijiserariwila.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/23977854060.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/dujabodizisoreketi.pdfIn PDF document text
    • https://ambalatender.com/upload/files/76990451768.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/metifimekaforadesunujis.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/26518180687.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/zafebez.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/xodekenelekomejoli.pdfIn PDF document text
    • http://zuche0551.com/upload/file/65377727416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lymphatic+drainage+contraindicationsPDF 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_off0000acca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCA 10988 bytes
SHA-256: e21369b263fbedce29d70f8b9d369670c31231d205210821bf6ad82cae86cb96
font_01_sfnt_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 14328 bytes
SHA-256: 7da837dff01efecb440b47f4101b360534007696fb45dad16aed9c457ce04688
font_02_sfnt_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1