Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e8b08021beaa7b…

MALICIOUS

PDF

86.3 KB Created: 2021-08-14 03:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 46651a85043b4cba8a7bd82e3977eacc SHA-1: e1769f5f35893d389f8cfb0eef41a2b8943d07b8 SHA-256: a9e8b08021beaa7b9a521710f060caab02d6d1f961548b6364dd2de02d8bb925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to improve search engine ranking for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=vishwakarma+vastu+shastra+in+telugu+pdf PDF link annotation
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f4e5d803---78581523597.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/68050436014.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d456b30624---91552996067.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/92dd051c77f7b0382170aa93ca8f868c/25803666926.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/256836517.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/mikape.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9tmji2nd1ak9if5ncqrr564uv6/92521478027.pdfIn PDF document text
    • https://ienter.bg/files/51256306862.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/siwizobirojutabakibatos.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7e2c376900d4afa1469a29b6bd563f3a/womoluvazixizoritumilifu.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/fozagomukasejexejexuxonus.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/67297177596.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/44967309239.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/3311483028.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/199a2e0951134c2beb9b527f4e7cb546/mugubazivitalejirevaxe.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/qc8c3l0amqnb2favn6jld15ph5/42359497870.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/jitivodazenapilulazulel.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/48061461164.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/natikeketomoroj.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088254ad7284---86344575770.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/35172316290.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/34478100124.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 11136 bytes
SHA-256: d09d08d5e80981511a5e14ecbedddc807ebcbe7d7b62cc6d2fb9b4d283161b2b
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 17764 bytes
SHA-256: c48ab06d74bda2e9e5857f71b6ede952ce708f9d3c6e13b9fdac56dee4c15ec5

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