Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a65a9274121ad4b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 01:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39de37741bbc2a32d1bb44025d47f977 SHA-1: b3069286919050b67c75c5edb535a1799ccea80d SHA-256: 0a65a9274121ad4b7a3a84242404fc3b6170908ac100a60e8cae44d9ea4d0c0e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by numerous links to external sites, many hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a potential redirection or download mechanism, likely intended to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=root+kindle+fire+2020 PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d73ad046e---8879314415.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1489d53ab---jozatefiruwewo.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/80296131000.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/49511046110.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/41c82e84c7dcf75168d0c4664b6fbf74/jasivezop.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/21221198923.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/64370768517.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/81366776531.pdfIn PDF document text
    • https://almavilag.hu/files/files/13226836687.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/93153221157.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/54940040595.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/30975648209.pdfIn PDF document text
    • http://calisnt.com/uploads/files/malujegudezinot.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/81774563470.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/resameluf.pdfIn PDF document text
    • http://ruihuitax.com/files/file/negumafomotu.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/78513020669.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161309077ed075---22219154840.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/as65b431hla7lfvq6s40ej01m5/28106631110.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/jikojuponemaga.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/27230450602.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00599f95e---94859054280.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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 10396 bytes
SHA-256: e68ae64d544e45c20035b97238f3d6b77ef10783f77335da418565a73da2b36e
font_01_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 18484 bytes
SHA-256: 3852f841d3c2db8071165900e0c229501d6952d5383574237a9405fa90e3bd62
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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