Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7cd75b8e59f81b…

MALICIOUS

PDF

102.0 KB Created: 2021-06-27 23:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 614d25d34a11de358372fe226a32819f SHA-1: 20df5b1a528015e2361153cac65d13686e143fc4 SHA-256: aa7cd75b8e59f81b012ca91e6854a12e0a51d268012ddc373fcc3a60106d2546
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or credential harvesting attempt. The heuristic 'SE_MFA_LURE' strongly suggests the document is designed to trick users into providing one-time codes or MFA confirmations, likely to steal session tokens or bypass multi-factor authentication. Numerous embedded URLs point to compromised WordPress sites and disposable hosting, further supporting the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 https://ketchas.ru/uplcv?utm_term=ndes+server+intune PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073ce6807d9a---xorukomegilunodi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd1a4bf8b---tujaxapurixe.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b9bed6262---75252863233.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/43928843106.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/warapamelimisitojogur.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/39740139470.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8883da329---91591493241.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1360a0227c4c53c083cc693f11f5dc23/nebodanojoluwulif.pdfIn PDF document text
    • http://kbchina.de/upload/92754032366.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/wujuz.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/3590385262.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837386d9e0e---subiwijefu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3501afece---36948619876.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/7f804ed1f2819d180774c6ac9668e4d6/mexujutirebibeneka.pdfIn PDF document text
    • https://sambelteri.com/contents//files/9598189576.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cee84f3a7cf93fa229aeadeaeb8e76b6/gepafosagelesobax.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ab7dac01---1121481742.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20a3a300a---fugixosujovelufezixep.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e9882cd---nosuxu.pdfIn PDF document text
    • http://rafaelokazakov.com/file/norikurumelisenaxux.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9a8bad792e1abd5396a199d09dc70da4/vuxorezekaron.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/76c21a5aeb555b9adc84c779a5ab2932/dafalumelakizexeligo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc88469331f---wezamewubipekuzofubeledat.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_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 17064 bytes
SHA-256: 6bc57075dc707577882ccd0e1acaec890526fe34168b6d22ac1e72aa273322d0
font_01_sfnt_off00015b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001731a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1731A 10056 bytes
SHA-256: 955699a8bc22a38ce5e13b4869edfcc64ce52aa287efb6ad7b99fd683d9de8e5

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