Malicious PDF — malware analysis report

Static analysis result for SHA-256 6464f128e75d227c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 10:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 421f98fea9085b168eeafa260200a977 SHA-1: 6364e34b0e2bbb9ba2761880b65ef9e88c56c9b1 SHA-256: 6464f128e75d227cdcda218c3634c2a5e7449e38cc5f5f9eb25fb1b836c63de3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://teamwork-poetschke.com/ckfinder/userfiles/files/nevabaj.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16135961863ca5---tumevadafutusa.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/xexawa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608551e82ee48---63867603048.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///67020247536.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b15e16b8bd5---48841042031.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/nevovokepirofobudibil.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/22642625895.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/un7e290fg0mqd9kc50ac64utlq/38938465163.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a6bdc5d4---65925752405.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/rajatadali.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dddd7f2dd45---22060635861.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cc897a69a4e12a10629ec1f39292d1d/mexetaletemuzalakoda.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/nuvidimane.pdfIn PDF document text
    • https://12waktu.com/contents/files/54218907092.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611edcb6adb21---26962548137.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/nanokexer.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/78700972353.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/xudebukokixugufagoviz.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/78838358860.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/bexaripanabifep.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/7380235862.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pveq7sb7pela616qa890pnlq7a/39596495619.pdfIn PDF document text
    • https://dpmceramiche.it/file/famakuverematexejizud.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161206398e5949---pamiporirojegugidofojin.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/losobedupemowezanasutet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mechanism+of+hydroboration+oxidation+of+alkenes+pdfPDF 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_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 11328 bytes
SHA-256: dd61bce129c11a0f6f2a4b7d2b00af0bf0642628467bc34e18fb40010baceb36
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 17844 bytes
SHA-256: c988393da9eab70639bded191506837074fa1f9169c6f52409ac85ead0fec506
font_02_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1