Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b546cab7bb1b22…

MALICIOUS

PDF

109.0 KB Created: 2021-09-12 08:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f5a7ac8c474a5a2a3d12d41aa2a88c4 SHA-1: 10e4d73cbc8682ef88f3aa5c12b36c70a09db568 SHA-256: e1b546cab7bb1b22083f2a826764f66d9c135e1cc0a6ea84491ce447ff2c1ea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or potentially compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arucax.am/user_images/file/98094564571.pdf In PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/74908550971.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/65447819542.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/joxinivinaromad.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/25020247800.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/51559168829.pdfIn PDF document text
    • http://air-con.ru/upload/files/kobamaxawulokomodopiruw.pdfIn PDF document text
    • https://qnzar.com/files/91823801450.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/92857a4a1c280948c01343ce9e171a84/52828535053.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/39587988795.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16138e29c821f6---22841221857.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/wevomibusikimurowoli.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rejineburep.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/15936059972.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/78540133739.pdfIn PDF document text
    • https://maturana.cl/upload/file/vuvojepivepesalekeze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeccf7d811---jimakuvosidukijokoluwosox.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/95463405619.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/banuxedumulepixalawerom.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/619532d623cf8b2922191361caf8744d/74382832087.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/tosokijokevisitegenim.pdfIn PDF document text
    • https://tele-video.ru/upload/files/99194048502.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/podujowivukisigap.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/jetudotekazun.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/nabisafalizazuwutimazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dragon+ball+ep+listPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13156 16396 bytes
SHA-256: abb1c5212c7480bf28b15a10519ae854fbeb9c662d095143ba48a910f5b7d4ab
font_02_sfnt_off000147e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E8 27976 bytes
SHA-256: 447579b52918db5c94ce4fd92bfe2caf93cb0ebd0ce4762620ba6257ce7592d4
font_03_sfnt_off00018dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DEE 10568 bytes
SHA-256: ae4d7d6aa9b8fc591d6a331467addc9238b03996a7cdf62f761fedb9c7c49c4d

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