Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18a01fe4b7adac5…

MALICIOUS

PDF

87.0 KB Created: 2021-08-17 05:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3798edfa6587da331dcf6f3799aae073 SHA-1: 33ff5abc3517b657e8573cd097dd0224d4ad3747 SHA-256: f18a01fe4b7adac51a959ff45514285a0d001ac5ac9500120ce75f666ee64728
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple high-risk heuristics indicating a phishing or credential harvesting attempt, specifically requesting recovery secrets or private keys. The document also contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an intent to trick users into divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=default+cimc+password+c240+m4 PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/1c3c701207ee62be711f1c02d62e5213/37768906560.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/c8187107a01ac53e9df57ae7a74b2d76/zosimawinavi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/supelusolo.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/95248048796.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/25cb4a6e2fb5d91f08296389ec4bf809/57931021284.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/19338512667.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/xoxerizawixidonitidiraw.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/wamudenijija.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/finilokesuwutak.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18dd058f5f---rapuxi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845a4d3b5b---33950580345.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59c274ecc---54762249350.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/55f5a3220bd570a70b8b81e80acfa8dd/28643548583.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/kunejuvitipameliruf.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/geronevasedusuwetiwaso.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ad7679217613fce492d42e766f5a729a/44627096848.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/naduniwuze.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3ed2e33a71cfea5ae2a60b5130fce103/pepunurimol.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/3006876208.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/2046771720.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160779528b37d0---45745177946.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_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 11184 bytes
SHA-256: ba9b438179f316d33e42977078f14d5d5b50cad3620c600fb65e21b29588ea2e
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 17732 bytes
SHA-256: 20cba312d563d42cd421617eadff2e9e5739d286b581c7aa7f2edbd7967e0d6e

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