Malicious PDF — malware analysis report

Static analysis result for SHA-256 941c0e8b002d2dd8…

MALICIOUS

PDF

71.2 KB Created: 2021-10-04 06:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5d9a8ae25d17e02cfe3dd7618ad9930f SHA-1: 103eff628e4b63afe444627df7cd739bc23e82f7 SHA-256: 941c0e8b002d2dd8452749f75e7b517a6193ee3f2217bed399b9a4ec96803a1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=add+two+pdfs+together+mac PDF link annotation
    • http://locke-3c.tw/uploads/files/202109040128345188.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/62963436987.pdfIn PDF document text
    • http://myphamasia.net/upload/files/gogazoxekokave.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffa1a27842---58282879423.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/xukanato.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/93a2c0b7604bc197b74c204a3b711674/zabuseg.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/6001097392.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/kijibuf.pdfIn PDF document text
    • http://poliinc.com/upload/files/vanosofifijixek.pdfIn PDF document text
    • http://terrietanaka.com/library/files/timajolov.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/volaged.pdfIn PDF document text
    • http://pneusmarene.it/images/file/golabolaxugorudiferujuzo.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/65537467325.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/tilegivexorirara.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/lutekobovedekavimivodapog.pdfIn PDF document text
    • http://it-hair.com/userfiles/77195887531.pdfIn PDF document text
    • http://coffee33.ru/archive/file/56942724181.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161340834e0908---78629973789.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/86721571719.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/wugogi.pdfIn PDF document text
    • http://kngsm.in/userfiles/file/wilonuzikenikenep.pdfIn PDF document text
    • http://talleresjpg.es/img/file/sotajajo.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_off0000b038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 17824 bytes
SHA-256: 60994c3f8134c62217d7d968454c6b72a049f0a9d9132e7bb48911c7468bf082
font_02_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 10892 bytes
SHA-256: 500dee6cb80a7c93130fb3c8a15f06a71cec86cb196caec6666092f087be35fa