Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a613375cf13f9c1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 19:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70e3fd00c6896adba805da577b8e83bc SHA-1: a94b136aa790cacce6166cd10180f8e8eb8cc0d7 SHA-256: 7a613375cf13f9c13856f90ac03f554cc0da39ed0cbb225aaea2ba4cf272b2de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=what+is+upcycled+fashion PDF link annotation
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ad970210b78adb604640260220a443d/soxifidefeloxemox.pdfIn PDF document text
    • https://vleek.com/uploads/files/62172283503.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613484c500975---kuwekotididegimet.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406f7fa788a---wojuses.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb426f7c5---91997450772.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6fe400ebd8311a39700c80785a79b66e/43049490133.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/11186245671.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/jexef.pdfIn PDF document text
    • http://cudicio.it/images/file/19066588169.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/57208668377.pdfIn PDF document text
    • https://timminsrenovations.ca/file/fLzp1S8exaZv1lvw.pdfIn PDF document text
    • http://fohow77.ru/upload/file/zafaluratepetux.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210911_003013.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ml0p7b883ttf9modqqq3s0nq1m/nitujekibufesoritogof.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3df37e883---sazasofozusa.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/28144055577.pdfIn PDF document text
    • http://liily.jp/upload/file/20210909091123.pdfIn PDF document text
    • https://superpart.com/files/73786038013.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/86287456362.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/53491203428.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/74518379598.pdfIn PDF document text
    • http://vning.net/filespath/files/20210904214248.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132f40b0ac32---fezojasolijelenisokejijiv.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/52803731874.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210908032254.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_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 17964 bytes
SHA-256: 840c7a5eb91ed4df1a72f978456c8e70ac290ddeb3877b12cf950129a3e70d0b
font_01_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 10824 bytes
SHA-256: 91188485f05a24a5c5a2246d59b3e036a3245dc395d1ecea93d93d2791179c57

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