Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ae7ac13b804eeb…

MALICIOUS

PDF

94.6 KB Created: 2021-07-06 00:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7d82366b7fa2c1a1a2950f5f47885a51 SHA-1: 3e45dfa1651d8a9171fabe320aa5ef95dddd415d SHA-256: 94ae7ac13b804eeb54fcc145877d9dc93ecb8dbb3b512c52ba45d87dbb3638a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for further malicious activity, such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=best+concealed+carry+380 PDF link annotation
    • https://majubesar.info/contents//files/keremowofi.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3b9ae332---vadolaxupezomofa.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/92666468589.pdfIn PDF document text
    • http://househouse.it/userfiles/files/notipewubuj.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb10e98f59e---bupilorowezeb.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac7e592d82---98877535577.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb673aa26---nusezud.pdfIn PDF document text
    • http://geose.ru/userfiles/file/sanixuxisifugan.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d71be06e0---99792104451.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2b7bfdc564a99538e23d07bd1d8f2845/lejaximuwixowakonezezuz.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/bekupuxo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607294544f3c0---josutoxuke.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/65714698944.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/figixafogedudokob.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/796e7716944773c8d665e6fc4d5c8abc/jononisikulibemirarozi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160846767d2fdd---kerowovomadowereb.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/40684865935.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/zebanarajetaregejuvufanet.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210531/file/33907529091.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620915981.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/5cc5e355bf341d9ee0b58edfda0b32e0/nepibinizevu.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279d768a68---wajema.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f45823db5db8c2a99833508fe4042ae7/35401370812.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_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 17472 bytes
SHA-256: 58265b18464fed67429c3f3c548f96ddaf4e3d56d4f26d42d4d1741e12e44df4
font_01_sfnt_off00013b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 10940 bytes
SHA-256: e5a8afa28fd9c53d2518bcce4199652ed362ec1e7fd12fbed1655ab64bbfaaac
font_02_sfnt_off00015531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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