Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4900406e5a82c7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 02:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a5fe2f1c15dea3a2e0055c358343b11 SHA-1: 9d27ad8ae9143bb4ad0a6d9eb8b02b7ed4640b45 SHA-256: ce4900406e5a82c73a3846580808090a8ebdf37107690830b1fd44766a9efcb4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bcaa4550b---92235818068.pdf In PDF document text
    • http://bhk-aindling.com/userfiles/files/xofogexipa.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/59400803180.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/2u4t95ih84jn7aicefp1eljpa5/sasexojupapuzelaredof.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/31123740025.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/jexolamajo.pdfIn PDF document text
    • https://avenue102.com/uploads/file/vedixolotopunemefimim.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/82065624520.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dhs9la5gq7euii60cfv7rnt1u4/xufegasameg.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/026396d75b354c01aedca9f010a6e668/22147300781.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805fc419f---4070813991.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/kexusigojijedanupebimijek.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088febd0ef19---pakokuwubiwikomixasosuzow.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/op5ol5p4dv6abrv5mjb1l9e398/28121563547.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/43419897316.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a54933dacec---25987833303.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/jugefagosanuta.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/41593723107.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161164152eed69---84166399397.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/369b92749818011d9510fc1c7f8eac5a/18919843729.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/51857f3c5b8ce0b642fe8d8851a4b51d/konitipibixuzero.pdfIn PDF document text
    • https://beaszemin.com/files/notipid.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/muromet.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e9834b476fe---wadusugix.pdfIn PDF document text
    • http://recviem.ru/img/upload/62839476985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=il+cacciatore+di+aquiloni+riassunto+pdfPDF link annotation
    • 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_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 10812 bytes
SHA-256: 513452889850aa446ae9276e80f1bca257a5bccb380fdb5cb1c5be30705010bb
font_01_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 17296 bytes
SHA-256: 0ba6e48e899d808af28c9f976e6cb14c6ee29175b18e9b5ff3cfa91728692eaa
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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