Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8c84b973fc3bb3…

MALICIOUS

PDF

80.3 KB Created: 2021-08-04 10:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79fcf7271f593e11a82d4f45a79f5584 SHA-1: 83b6e6c21e28d4a83696af417b3f07da3eefb32b SHA-256: 1c8c84b973fc3bb31c0a5a3b4193321bbfe60fe12fd1005ada6d09e6273b78ae
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 uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://stijsr.com/userfiles/file/67148535585.pdf In PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210718_E80532CB17A32AA4.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82e3238c9---251769106.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/vinipikolomabetowupoj.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c945cd15835---firurotapexa.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83b240c7a4---wefotagufudajudero.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec89ba98e---5843596403.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/15479680164.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/95c5a0d8dbaf25e610337d489b7386e1/50423046994.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/tekudenifobap.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b131fa6ee84---67499526664.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/66090353038.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/jobomebamolafofelomofaf.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/40458596964.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48bc21f39---tures.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fff4ebb8d66a4dcb3f90a44a611d9d95/79544518591.pdfIn PDF document text
    • https://daismene.it/file/48232272815.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/dilemidabiworegogoga.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/mesativotovubap.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/siwowaneximevevidaxazop.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/fcdd85e908f71ae651fb32be2f15da6b/76368385250.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160983037904cf---balevakax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=converse+inverse+contrapositive+examples+mathPDF 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://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_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 10840 bytes
SHA-256: fd8caa384f3b6ac5f5e0cb97dff92321918ec47b15afe2b92e390d68e1deeb7e
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 17704 bytes
SHA-256: 1faffd0061e13d4173234db69797a445bb5702b32e3d96cb1d6debd5f9405f36
font_02_sfnt_off00011ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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