Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc14770a1cc78b95…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 23:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b8160b5dc56ffd98891f7fa5c6d151c SHA-1: c934556b13f4fcbe6f08a1b00d974e08eca82847 SHA-256: cc14770a1cc78b950b936b5ef638ee10e86e872029c3a9ff3146818533138d2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the heuristic firings related to link farms point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://badischer-kunstverein.de/ckfinder/userfiles/files/81125943141.pdf In PDF document text
    • https://studiovizia.com/webroot/img/content/files/gomigupesew.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/q5f220vq9p459hcd5b2g558mt9/mebikipazinitogupane.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/tepobegerizexuvedaso.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/towix.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e005f2baf---gekinamibuxiv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c36004bf---97227065190.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/51f64a81985ef0b3b4fb4a07d9bdc97c/42841178546.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/noganapafakupovamu.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/firelujedadododopobebeg.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/nelex.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/mawezarijurobo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160989b3cd1a8b---40389573679.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/fiparadoru.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/duxejopuza.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6a87f31c89aaca992f5c485c75e9789c/xidij.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/58280945654.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/gelun.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/monaritod.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079371ac557b---mufanobekidetados.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608082422fd43---26389540441.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/721b49af84848c4e142228a6a15fe433/60587830447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=protocolo+de+internet+ip+pdfPDF 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_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 19664 bytes
SHA-256: b87ee1f24281b3af40bfdc4f3780c020e395b81e8e5beed59288f080cddf0b7f
font_02_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 10284 bytes
SHA-256: 6d9b56394d0914da4569bbf2ff818a4578105c518105d8a2ec5fd38096194fd0

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