Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3404aff1b984429…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 10:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20bc3f25b9f0cc4bb2ea5169210b7c60 SHA-1: ba799dd1b87fec03afd6f650fd0b24e4d08eb548 SHA-256: f3404aff1b984429c18c5a09862bdd928eb8773782d8472a39808727a6e160f4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://cutskytools.com/d/files/89756717719.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116f550cd5ab---nebabozid.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/56421486287.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/lipegazejevasin.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/31457330956.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/56795368869.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/30457786994.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608901cff11e6---retonebonise.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/23525fb07b4270fda8aceaefb1e4be79/povekoletepobisi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a5ae172e2bbd968d7e706a4b265a24b5/kazofusodizuva.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ib2kug73k3mh2l0eab619gklr4/51217698099.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/10bb3mfjs97c305btqhfiu8vfn/43571618467.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/zobezeneronog.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/606bf73183e6d2368a88cd370709835a/36985486676.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a613c1ed02a---bopopuwitidujokojo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/lkcnb0n1gsguh94lgh6ss8ah81/xedaruvadusabofojag.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/4490479622.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b3283dca2f897a923775f749c8f20d7a/didixefisopitizofejis.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff821517d---54193633716.pdfIn PDF document text
    • http://24cvety.ru/upload/files/xafopimukarixevov.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/23146781574.pdfIn PDF document text
    • http://placc.info/up_image/wikoxabopovenevoz.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/82592545013.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/tadinufatuzane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=worksheets+for+kg1+cbsePDF 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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 10488 bytes
SHA-256: 45ca5380377a61d45792ee20ad6e5575c28926f8eb6e2228f903494f2d5289f6
font_02_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 17292 bytes
SHA-256: fe9c5c51b25ebc4a83e0d012fc314f5150f3914b1af288c97835e3e2e5ce9a09

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