Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cace5d4c440ec4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 06:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d41fe745021ea097e7fd2e0ad31d109d SHA-1: e04be48d336b9fbc12a327ea73d8e3c5db92b3ff SHA-256: f2cace5d4c440ec4441b619295775eb78be064949b101a6eddfc6ea529cc12b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the nature of the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://frankifoto.com/uploads/pages/files/13958366301.pdf In PDF document text
    • https://majubesar.com/contents/files/sopinabasizuxuxere.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/wodakebolazezigisitap.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/wulapomojomefasulomosol.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/zekorubi.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/44032481155.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865b11b30c---28040671296.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7035624570.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/97655541738.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/87960585404.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5153725f---jovip.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/zebepupuvelojo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143022dc1a75---pupikirejozutovare.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/75313829116.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/jugufakizupowigeta.pdfIn PDF document text
    • http://www.og2c.com/images/file/89991976505.pdfIn PDF document text
    • https://thehouseproduction.net/file/65977832680.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/52892224980.pdfIn PDF document text
    • https://harmony.im/userfiles/file/65179457476.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/xidulojawevovudajawilux.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/vodasakemenifafux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+app+listen+to+microphonePDF 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_off0000b20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20F 17132 bytes
SHA-256: 36921f4e5f31f48365427c3011007ecb70c356fc416d62d043c7e6701eeecdbc
font_01_sfnt_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 10760 bytes
SHA-256: 8dfcb1cd416ef3e341d1373c39e66aa16c91b01a6e6b0e5379ecf9de93559ba5