Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c7a1fc9afb6525…

MALICIOUS

PDF

75.7 KB Created: 2021-08-27 22:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 611d3ee0ce958b58fa014fdfb6ede6a3 SHA-1: 1fdec0b1f2d7e98b94bd61817cd58ae9eeec73c0 SHA-256: a8c7a1fc9afb6525b485f2f45a735c4fb4e4b55eaad7d9c033be349cce6ab067
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely for phishing or distributing further malware. The heuristics indicate a pattern of using disposable hosting and compromised CMS uploads for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=the+periodic+law+puzzle+answer+key PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077968ea13e1---26161971220.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/86744775823.pdfIn PDF document text
    • https://peterdegendt.be/file/8239287976.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/kujarutes.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/tv7pon3r52oiogohkie57pdm60/53667681399.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/40760704966.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9680d6f37bbb69ba6d25b2223f94cbab/48069178903.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c655637852---vowiwi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072177e23597---40033780886.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8aeef5f5---wuvasabiki.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458965e419---parivakuvino.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/14534961913.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ac524290e1a---gotarotatujowiwusetepofo.pdfIn PDF document text
    • http://healthywithhart.com/res/file/vetibuwomogodemu.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/46152520150.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a9fecd904b264498f4a99018438eca99/97331967348.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/tususujimirob.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf03f2e121---jovadafotalitupurujujor.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/ketugu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1625975bca8a8b1646039209d9ee2a79/dazik.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/loxeduvunuwotavoxos.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d718dae0---78005297220.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/71535604796.pdfIn PDF document text
    • https://alohasafaris.com/files/xajebipivarabumojikas.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_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 10928 bytes
SHA-256: 2f4eecc2a1c15574cb7c8917f691c8a2c725f95875f86ce9cd6996804a01e8a1
font_02_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 17336 bytes
SHA-256: 6a4d660eddb06d44a57ea5322762f0b9e852a401433dae0ef2ff512009ca527c

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