Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cf7ed8bbd08022…

MALICIOUS

PDF

94.6 KB Created: 2021-08-20 23:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4909a7e103e1171697f9c85bb9da0e8 SHA-1: 712b3015ad3f1aa8f5ce77099e919d343a1c52e7 SHA-256: a7cf7ed8bbd08022e7771b1014a607eea7a9676409e402ed969adb20392ee8bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and exhibits characteristics of a link farm, suggesting it is designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts users to call a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the presence of multiple external links and the ML classifier's high confidence score point towards malicious intent, likely involving redirection to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=anhalteweg+berechnen+bei+50+m+sichtweite PDF link annotation
    • http://pappteam.hu/userfiles/file/gunagese.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/68053791171.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/malipofawuvik.pdfIn PDF document text
    • http://skupka54.ru/upload/m/logujonuluwewov.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///93320708630.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/volusujidoxobaje.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717c2588634---97634621210.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/sezajojunatamutaripiguf.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/16278002277.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210806073808.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/148209914e6c3a65ea23b53d222551a2/sotole.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/dubinilezawutilate.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gjp45314nhrr6mt01ss3oploj5/guzud.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8j8ok0dfdckpmnfhq9to07cut0/fixagupudogejolejuniked.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de39630bf56---zaxetutonojubofudotemolif.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ea66f84bc03b576722906afe3a215176/xogifunarulepe.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/xeligogukaraw.pdfIn PDF document text
    • https://autoskola-scp.com/files/52061464756.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/27953631421.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/kulivotegexowilek.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/mewosugezitodenejamuna.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/sazotadesitaveletepefi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bqbelorgige245rhb0b77t725u/pokivosirulodamodakafa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f96376467da---70798120069.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 18444 bytes
SHA-256: c1576b72a313b016aeeeab3f122f23aa65c0d3028d7c8008fe7f43f21f8bf905
font_01_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 11020 bytes
SHA-256: 4bec764d39797567e6581acc913826bc529834f3f50f8af1f01793ef5ad44a86
font_02_sfnt_off00013e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001566b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566B 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d

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