Malicious PDF — malware analysis report

Static analysis result for SHA-256 c754ecbfc4f81dd6…

MALICIOUS

PDF

89.8 KB Created: 2021-09-13 13:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a2519d2e1be2089eeb40dab6cd5971d SHA-1: a3d2e0268c05f4b25169eed4766cdd6a90d08d11 SHA-256: c754ecbfc4f81dd667ad690bbd54a1fe862c670cfb6c49a2fd58989524c48dd6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number under the guise of a billing or security issue. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing attempt designed to elicit a phone call for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gsacademy.ge/uploads/files/jadav.pdf
    • https://iskoruma.com/upload/ckfinder/files/zagizuvudipenewi.pdf
    • https://bosingels.nl/ckfinder/userfiles/files/67656962715.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/bedabozadiwufimipebafu.pdf
    • https://suacuachuyennghiep.com/uploads/files/57572571218.pdf
    • https://appvid.eus/userfiles/files/78739128848.pdf
    • https://riolisboa.com/images/ul_files/file/ifaB8rEtlH1W.pdf
    • http://mirutte.com/newsfiles/files/25558593056.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fecfca018---rileriwezevefikobazipixuf.pdf
    • https://xpress2.eu/ckfinder/userfiles/files/nuzusetexamupedomunofel.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613761d4e3aa4---69118575573.pdf
    • http://nesemlak.com/test/images/uploads/files/22896206431.pdf
    • https://sunpower.lv/ckfinder/userfiles/files/96750702498.pdf
    • http://seanmore.com/userData/board/file/rukelifaf.pdf
    • https://vaynhanh365.net/contents/files/wimaporu.pdf
    • http://merwepizza.com/upload/file/gisevunizetekunerixofum.pdf
    • http://kahounova.cz/userfiles/file/83004141575.pdf
    • https://villamishkan.com/310renonew/front/images/files/36421390514.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cogo3jnagpo4ekngqll796t7lp/zoxuxugubivojozenipex.pdf
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/sodalosona.pdf
    • https://traffictkt.com/viking1/uploads/files/rovamafojituvorojepagema.pdf
    • https://mantyobras.com/userfiles/file/72433058201.pdf
    • http://onmamtour.com/FileData/ckfinder/files/20210911_3405F2E56424150E.pdf
    • http://trustarshida.co/cache/fck_files/file/13589126937.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/29498350319.pdf
    • http://hflchw.com/upload/file/wesanizugelagelojeso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+rules+of+love+richard+templar+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8e.bin
0fc5b209a48b49adb3f8c1b0ea44f2e15093f29913fc14d1120b7844b98fe034		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 10908 bytes
font_01_sfnt_off0000f6d4.bin
759a548f6a899358463fe51d3d2707672b9bc683e72d4b0548489bd388d29b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 18244 bytes
font_02_sfnt_off00012662.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 16792 bytes
font_03_sfnt_off00013e73.bin
16418e13fb5d5d7a105b85b3412f8db4c47475022bcf2cf4297a1fb4d19e544f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E73 17740 bytes

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