Malicious PDF — malware analysis report

Static analysis result for SHA-256 35740d2b1c974769…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 06:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cda96ddd93c1814f644368f25b15de0e SHA-1: 32737f8cd962bf2857b5f9c0eea878a48a5340c8 SHA-256: 35740d2b1c974769fabfbf095e628453d4645d5f86dad1e0304e957c7be8f28f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://optometrystaprzemysl.pl/userfiles/file/videgumigadijakan.pdf In PDF document text
    • http://kmbb.at/userfiles/file/63370565526.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/44343624572.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bevararogefolixixufosotes.pdfIn PDF document text
    • https://stormester.no/files/file/nixomab.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/xizupifubomozomatimik.pdfIn PDF document text
    • http://bastola.org/userfiles/file/22927607183.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/59783743712.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/2243429104.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/10890242594.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/nijidetel.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/sozuluturisonamebiduzep.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae7764844f---90534600144.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lisojimirobabilak.pdfIn PDF document text
    • http://scpt.it/userfiles/files/73346391325.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/lojeboxidibo.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/gupukulilojazazuj.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/12080791197.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vegimiwebimekizogeka.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/wofobetaregiwalafekov.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/bajoxivujamizumivuwakapu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138058900182---72567766664.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4610d0fc---89634723756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=folk+of+the+faraway+tree+pdfPDF 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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 10500 bytes
SHA-256: df2d65034e1020d0313f22be79f0de4a39f791855e9446467c8beacf1b902782
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 17524 bytes
SHA-256: 94950829ac3191f9232bc69531de72218f904839a22b20e35a978db8adde83d5
font_02_sfnt_off00011d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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