Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9c7c548113f365…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 01:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 131f43939f3ab6759a4918d41e76ebdb SHA-1: ceb9a781cc79fa008db5579884a3c88e94008160 SHA-256: 4b9c7c548113f365d633f6101a51828b330c4f587dec986b6e3cde4c6f309774
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution lures, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mobiliteit.nu/files/90075472984.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/biguvukosaf.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/didow.pdfPDF link annotation
    • http://masterkontroll.hu/ckfinder/userfiles/files/96167839704.pdfIn PDF document text
    • http://change-sexy.com/files/files/22662422192.pdfIn PDF document text
    • http://ombs.ru/uploads/files/94237038258.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb21f5be8f3---21821045380.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/fujufaresopazupexan.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/mosukajanav.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/geserisinus.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/tnt21km7uot2be07aft3sa6fdi/jewojuxavuliforojezoruv.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c34839023d6---31431414941.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/ginufuxiz.pdfIn PDF document text
    • http://njchemland.com/upload/files/dulogutunaduz.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/68751862186.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c50e39cfffc---6398068733.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/96399464820.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//74187846968.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/viwoxojabi.pdfIn PDF document text
    • http://fullx.net/files/tagebakelefumezowuse.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1o85gp38n7b8i8b15e7ri00qrb/kafovurivolajurexikaluj.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7b158bf2---midekuzokumufej.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/53178061415.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8131543b3a---18813352242.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/14991217974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mclane+power+reel+mower+manualPDF 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_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 18428 bytes
SHA-256: 5ba27e7df23741589b2c47979a29b7563606159b0a24a4549df1f67f78d12a05
font_02_sfnt_off000133b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B9 10356 bytes
SHA-256: 02e61d3a65d7e21a78a4fad890211fd0c416a8199d537a225224f5812db02d49

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