Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa9acd00a92b3ca…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 01:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b49a0c7d47dbd42ddf71d30c6f82fc5 SHA-1: f0063f9aac20b31ccc53a054ae8155eab54b991c SHA-256: 5fa9acd00a92b3cabd6084c3f727d884a6da1a394e3cdb2788df811e9a927e03
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly point to a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://gpmpoolandspa.com/ckfinder/userfiles/files/fenagatevobig.pdf In PDF document text
    • http://amadpich.com/userfiles/file/14446277752.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b99502432---8302993517.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134955d01763---63198342193.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/saketufi.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/21603763554.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109081711222620.pdfIn PDF document text
    • http://carbontuning.ru/file/puwisenalemerok.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7a593d109e77e6cb5cd921e91ccecfc7/36429328307.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924bf2832a---gebamokovoremu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613043f5889ff---65999999580.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/54171380326.pdfIn PDF document text
    • http://klaaswester.nl/img/file/zijeboz.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3hme4t2u7doqa43a2qnr6gdij1/tuvenu.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wupanogejexigutinipisew.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/gimupuwafuxuxu.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/sexodikidifi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd60a1809---simelujumebokomupelag.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/65773262057.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/zevukixoremapumopoj.pdfIn PDF document text
    • http://hanifeugur.com/image/files/pexikoralopakudiwame.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/83415074680.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/vavanowikixabud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=oops+concepts+in+androidPDF 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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 17848 bytes
SHA-256: 652e94befdaca7e1d69a44a58135631b0fd9adcb6813befa630adcc24806b5e7
font_01_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 10488 bytes
SHA-256: bcfb348fe64db52f50d5f343e2a611c6ff77a9914cb281584a15368e25f61e61
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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