Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcfefe8da207f11…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 19:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bab08b871ea14fe683bbf978930bc3f SHA-1: 8b93e69ae6c3784215c7d2fad7856b2ce2254a10 SHA-256: 4bcfefe8da207f113162cc47022f42cb2ed6750c50252843e0be75abf247c769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tranduongauto.com/app/webroot/files/images/pages/files/43964644479.pdf In PDF document text
    • http://gowowdeli.com/uploads/files/41764340361.pdfIn PDF document text
    • http://scarpatti.com/files/natuf.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61725600013.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9bc2156668aea6d7df2b0a9f1ba152d1/96667031255.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dce9fcb07633ac0eb976e5954ae1f6d0/59132705203.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/sovosijozalizatamodanox.pdfIn PDF document text
    • http://telecycling.org/files/file/5400150931.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/58717973743.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/furemekitisolerubu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cae80f0b4---dopogute.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210906_DC36F258BD49C3C4.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/figagox.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/19683632388.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/repubateb.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/tuxotilitafapekipemiku.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/masebilo.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/nurepuzatamimifafuxuwise.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/penorubumimifipirowuw.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/38986548748.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/32514134403.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/lolawowa.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/dovepetuxodenozetit.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/wewulugekofel.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/081758337920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+phone+says+safe+modePDF 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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 10536 bytes
SHA-256: d1f606829a6f1dc5f3ba6f2f2d05b4eac7fe5cf7aba9b30509e48102db304f52
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 17656 bytes
SHA-256: c2a319d4ecc819b14f9bbc8cac2a040fc0268ee62ceee20cff43a435ad5bf430

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