Malicious PDF — malware analysis report

Static analysis result for SHA-256 63281a2bdf11a433…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 10:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a1b479c11c02abaa9d62f15c6d3d231 SHA-1: eb92beb3c1da3ccafa5d87f02bae54f4250a2874 SHA-256: 63281a2bdf11a43390a700f6d74ec1d08b30c5945cf2d628049974cfede6bac7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The document body is unreadable, but the heuristic firings and numerous URLs point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=is+a+giant+panda+a+herbivore PDF link annotation
    • http://keacg.com/upload/files/13793182953.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/piruvegi.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/25154578396.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/zezefobawawejamelavumerik.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/sipumofusufirol.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/sujubigegajajemin.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/97571155180.pdfIn PDF document text
    • http://starsunited.at/upload/files/lapogapasenuk.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/jegadelifamoja.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc3c148e6b---jimepuwupe.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3db3565b6---24998524664.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5b374c49cf6f1fbbc0ac8e3781c1c8ad/29633983574.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d789cf3333a---powuzajame.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tekbjm7q6srgopdv5fnju9vlnb/dubarolowizevawijamuvus.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf23e524ed---6016735143.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/wokalologatakolubil.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc1517c30---10839326308.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7717b4e212---50352308579.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/24927035934.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/gowonujazet.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/511d32433fc8cd4f82795b329a228f39/goxawoketinukuxikunimi.pdfIn PDF document text
    • http://kochi-mimoto-iin.com/TakamatsuClinic/userfiles/file/15527461540.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/sinitipubu.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_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 10780 bytes
SHA-256: 11e1e010b5412c8218d466d985f2af497515677bbdf300ec8182a09d7078c1ff
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 20208 bytes
SHA-256: bca9936204f1534cc63b39ea739491632a654a36e8ec593d9b73e768ce12c34e
font_02_sfnt_off00014379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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