Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc80b6593d12d8ea…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 00:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9518a26c7c278e4e188f58bc8f6b2e9a SHA-1: 45aecb6355b47319ec137704134a2f356c3b32e3 SHA-256: fc80b6593d12d8eab3fdd449261ae1e606bac8e0edf04d447d6e7cd6ea1270df
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute or obscure malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://beautybybelief.com/admin/images/file/35384366490.pdf In PDF document text
    • https://penzionradvanice.cz/res/file/sugatizosise.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/29411422328.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719c23b8435---jazepud.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/rolewusamikazibodikuwiv.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/57284863619.pdfIn PDF document text
    • https://energooptima.hu/upload/File/wiwelokasafape.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ohe3vf30d2tsga2ctd3opn6723/makadixuzuzilibofizebonub.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7e5219e90dd6e1b2e1e7baeea8cbdf3d/3487959924.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5daf35d775---23457141231.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/65137711769.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/sikoda.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/57124e0b475e0417886d0568485771d8/xomoririwilulizowuwawuj.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/vogigedalemesajijosejisu.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/19066041646.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/digimokebojun.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/89637829659.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bec86c62e---sufeg.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/62c00ccd8d7b43ac0f714888f4564474/wusikoziratavagipototoru.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/torabifurosezazovumopaji.pdfIn PDF document text
    • https://matratva.in/userfiles/file/sipigi.pdfIn PDF document text
    • http://castel.lu/userfiles/files/85964001697.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109011358516132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+five+tibetan+rites+of+rejuvenation+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_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 16656 bytes
SHA-256: 613382b049bdd4374823670a59b01a1ecf19b155f5b8594d0ae34b5638029cc4
font_01_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 10948 bytes
SHA-256: 74a0b5f011c4407a66fc149b848a187d43491a2ace22fca37096b17ead0a7c15
font_02_sfnt_off00012c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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