Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa893bf6adb26730…

MALICIOUS

PDF

68.2 KB Created: 2021-09-05 10:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3915d978c600b3394a40ad8444378524 SHA-1: bc6358cbf7684fd16f470c06a7109341ca17afe1 SHA-256: aa893bf6adb26730705ae4b1a350ba271a705a1b805f85c7fc74f712d092e7c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only design with a clickable action, typical of a screenshot lure designed to trick users into navigating to external URLs. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=1.6+photoelectron+spectroscopy+worksheet+answers PDF link annotation
    • https://marblobathware.ph/app/webroot/img/files/vujufepovumawemokip.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210728_EDF18DAD7E3FC825.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/zenevisotafus.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a0f2f1cfba48ac8c4ca8e817811f9b48/surezer.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/fosipezapononino.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/nuvixarevovavoranika.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/17109390850.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85bcd43875---53396544095.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e244ba2515---75970149667.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d62a3961e---61361884982.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/38073871092.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/47749497006.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/wukefirajexiguwiratebido.pdfIn PDF document text
    • http://ailizia.com/userfiles/32571048759.pdfIn PDF document text
    • http://taxfreepoint.com/file/ritoduximovebakarexabope.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fhgno0s9s1un84m1k2rckegabs/buxujelobazijizumop.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/91973569138.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6939c869b2b386256fa725895bb31026/gelanogukowisudoboziremot.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8b364b8266db95a3dd7aae2de39e0c69/mibenepubabo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9eca98d6---66251196228.pdfIn PDF document text
    • https://inifd.london/uploads/file/19839033165.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/lufaburole.pdfIn PDF document text
    • 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_off0000af91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF91 10860 bytes
SHA-256: 525fca30c39339320d93547683ac6c5224dd698fb483b4375f7576a6d18f074b
font_01_sfnt_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 14144 bytes
SHA-256: 0f8b27ccb0cf6415f6c5a2272f6245ca3fc4f41e321cec2e103dc19bae5c869f

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