Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89e2df62ba86aad…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 08:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a8efad3e6e085efa41ba64e12ddc837 SHA-1: 385acde84311c62c32a159d6fafd83ff73c36be4 SHA-256: e89e2df62ba86aad157dfc7df1aeba286c0d7615e2bf82d7786f5ab7a9c94706
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, a common tactic for SEO poisoning and phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it may exploit PDF vulnerabilities or serve as a lure to malicious content on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ackerviewguesthouse.com/userfiles/file/49857943006.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/8366kcg1fh3e4eup29b5glpja6/88223986827.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/kotujefabudobuwizopu.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/gebilokekavotivavekida.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/bijosiwugebuxawina.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfac9d62d1---84216488996.pdfIn PDF document text
    • https://seikai.jp/free_images/files/19319045857.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/gajewizopezup.pdfIn PDF document text
    • http://midel.me/userfiles/file/fivabemavisipiw.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/gazejumuwuvimi.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/mawopovepaxuwemu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c903fff35c878802bb609f4a3b4ff509/42507528102.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/929e0be8db15e6c975a33a852c2cea60/59968602555.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-29/20210729215533435320.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/45d222bf5617b343475fd47d1aa8f72f/69904401113.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/93380550002.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfdd566257---ruzox.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210727010947.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47555949956.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lonofonutaraxova.pdfIn PDF document text
    • https://basisnomor.com/contents//files/pidavomulakeluvuvisozusi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5aebc5a9f83f4e9ec4726cc88e05e11a/26200002677.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/26792472026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=yoga+mudra+pdf+in+englishPDF 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_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 17488 bytes
SHA-256: 3120d70c048dc8cf8ed9dd7da2dec9fa4e27735fa145d1900dddbe69edb8b713
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 10932 bytes
SHA-256: e31ab3f7374f07dfcfd5c9c9147114ca9227f3330786f544b30ce3bea7971b27

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