Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b33b9104450266…

MALICIOUS

PDF

87.5 KB Created: 2021-08-19 23:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8544c03056fa847611d1f215daefd423 SHA-1: 85ddeedd445fe990edc100152f844de3bae1534a SHA-256: 22b33b910445026610de289c1ea84ab58fc8eb9962785cfbbf88abc70a8be112
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pixomot.ru/uplcv?utm_term=how+many+dinosaurs+have+been+found+in+montana PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lrt5pmg9lnsav128rtt12dv024/55811657394.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_135805.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gngn0i69fq08hsqtv4pqfn8sse/40632791542.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/85140170403.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/47615632277.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd06bd32a84---palejuxogokofegir.pdfIn PDF document text
    • http://abwva.com/uploads/files/52364927324.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/41179485355.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/vebulotaxisoxu.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/doxutogozamisafawinadet.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/30101117828.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/15441169616.pdfIn PDF document text
    • https://mollis.rs//files/rupefipoxu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160739f8d1ac75---16493535673.pdfIn PDF document text
    • http://technocom.pl/editor/file/51116742440.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/63550399767.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/fajiwizitalubekugowaxupit.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/26994191918.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/vitoduzulotimizisimew.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/g5gmja9hon7enas8r3b0ppgfm7/18278103932.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fa4fa4627abd72a2e9562f7c5bed4a0d/2591487555.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/6344586889.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a087090e487---pokubovipewigezed.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/eb52adb005d9e46ef56c5e82684b42d7/vowutijisoko.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/wuduf.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/10797554704.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_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 18088 bytes
SHA-256: 7565a36f9aadb5a18ebd19de3aa51e0546a64cfcf1917de18e5fb525c533656d
font_02_sfnt_off000135da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 11072 bytes
SHA-256: f05838d63ab3924cc2bfa84031f5394ade2fef07b98d0e4dcfb038c924c26e1b

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