Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56de18fb81d0b30…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 14:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ba155ac2a218eb4531c9ce15dba98a49 SHA-1: 53a2c7bac5a0b1cc17bb387e7ac254f3624468f8 SHA-256: f56de18fb81d0b30264a918e7ed4055d83abfc8de375ff3e8ec6f4fc1446feda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://novichiha.ru/pic/file/vomukogew.pdf In PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/dukemedigolajivosoxale.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/38997007592.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/37750014970.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f9010e95f5a598bc2e590f3ae40b2ab2/lanezenofeli.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/38952281512.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/21386842211.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/39050579373.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/67408866462.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2a9db69aabc7d52f4d98127385707ac1/93104771038.pdfIn PDF document text
    • https://people11people.gr/uploads/File/zureriv.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f76e8633e68---63844335621.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/28975553373.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16077c83b0d683---bulujopivelu.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/50134726893.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/41ddeb827a4e4b0c5f9edad54b7bb071/34014826903.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8f15f2dba5eb53094388307ff081def8/dagujez.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ad39531a---19482783045.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/97513516372.pdfIn PDF document text
    • https://t2sc.me/userfiles/5263576827.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e32012031a---32310635386.pdfIn PDF document text
    • http://redactron.com/userfiles/file/geripikazuguzudikibezu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/makoduwatojujagepo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4d54e0b49bd0bc533795e973fd763682/83716828713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=inpage+phonetic+keyboard+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_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 19264 bytes
SHA-256: 2acb9a31e0ea5e41f5f8add2b8e26ef9b90edfd483cfe7d2e84fa8b4a061df2f
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 10980 bytes
SHA-256: 09f4d9c1cca4a072b707dde866dc3c04a836df78f43bba6cd12335b4bf295009