Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29d7a210bb716d9…

MALICIOUS

PDF

75.2 KB Created: 2021-09-28 12:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97210e2e47cb8dd7c9b8fc77e7ba848b SHA-1: 046f6d8074851b440d9c25982d0b1a9d8a2b73e0 SHA-256: b29d7a210bb716d9cda69db4b67b62b0f421b81d6072c1529e6732ff3636fcd9
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 ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://nomylo.ru/uplcv?utm_term=the+vampire+diaries+season+7+123movies
    • http://fogathajtohirek.hu/fckfiles/file/xufajegodadobopixevajevi.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/20ifb2qet8c06trs5pj284cmno/36189124607.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614ded3c9614f---towax.pdf
    • https://perfecthospital.net/ckfinder/userfiles/files/kugezoxex.pdf
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/1511034945.pdf
    • http://abbeytraining.net/userfiles/file/wiveniju.pdf
    • http://dentistturkey.com/image/files/61430453728.pdf
    • http://lehnerkom.de/images/uploaded/file/40509218172.pdf
    • https://glamweddingdesign.com/userfiles/file/zuboxanofutokemi.pdf
    • http://kayapaliinsaat.net/file/42379562013.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/30983787981.pdf
    • http://storemisr.com/uploads/files/72509181681.pdf
    • http://murielbellhomes.com/userfiles/files/40518904808.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_13_05_45_27_4059.pdf
    • https://tuinvandecruys.be/file/92153360994.pdf
    • https://mashura.co/userfiles/files/33180876604.pdf
    • http://hjhchem.com/upload/files/zenefoburanoposibap.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/25645815818.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/87046120514.pdf
    • http://krr-nfe.com/suratnfe/UserFiles/File/biraxevusizekojazupon.pdf
    • https://rtquery.reitoken.org/Coaching123/images/files/97773444538.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/bb8a6e544d4829e2622a17d28e86439f/77953095874.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc75.bin
56c10d3507fa87d1e065cc054bf21d10dc9bb78c022e52fe31a954d3f0b4dd8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC75 19732 bytes
font_01_sfnt_off0000ee2d.bin
cb0873fa6e8e9ff19e77d52f7d866884684a8ed18accbeb7c87584fae3fad51c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 10936 bytes
font_02_sfnt_off00010774.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 16792 bytes

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