Malicious PDF — malware analysis report

Static analysis result for SHA-256 84554fc087fc0137…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 21:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 750f24c00a6795ad6e6c42add279cb32 SHA-1: 050460012e29df8160e8c770d240f36dd7f778c3 SHA-256: 84554fc087fc0137d0baa7a39a0ddcba6ae9d052c766b5b6a4ff598eb6dd66c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to multiple external PDF files hosted on potentially compromised or disposable domains. The presence of JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/7454960199.pdf In PDF document text
    • http://strahyi.ru/images/file/nelofagelivijexefejuzogi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307c13cf708---vanaxonubivakadikozajuvi.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/wiminimamegobenuxu.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/befir.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/12534374348.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/jaladabutebinap.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/fogijap.pdfIn PDF document text
    • http://aztkgb.love-mrt.com/upload/files/57352597330.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b4e553e53c47061c405062445f4d7405/98560075073.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7ce4017c29f4a16997310d9487ea8952/fenomozepemor.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/zolixepoba.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/96685624047.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/bajatuvutuxabegide.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/mefonafimivizepusiw.pdfIn PDF document text
    • https://upaspor.com/resimler/files/53045106063.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613da778d996f---tudet.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/bibof.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/85608430759.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/zibeximibiboje.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/71090212081.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/8831688922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=calories+6+mcnuggetsPDF link annotation
    • 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_off0000b108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 10872 bytes
SHA-256: 1696714178aedd649d4a43ae576e40b27f009d4172bc4e1f1ea7d0d27f2789db
font_01_sfnt_off0000ca32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 16284 bytes
SHA-256: 0f4506024c208142210c8f9179046f7c72446d29289765b980366404c099bdff
font_02_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1