Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56f9ce380aaabaa…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 08:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b508bf19f8483334ee4811a37072cea6 SHA-1: 10b82d79dcf26bd04f8f605b4b43ed20ae72559e SHA-256: b56f9ce380aaabaa35cbd9f339edac4c8ceb017b7c673e3a1a7a2730ca261cdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised CMS upload storage. The document body is heavily obfuscated, but the presence of embedded URLs and the 'Fake invoice / payment lure' heuristic suggest a phishing attempt. The linked PDFs are hosted on disposable domains, further supporting a malicious intent to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853229b8146---64423678093.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i9ia3u72t08m9sr2smelif0c02/wedupopagisikexanevimum.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/welow.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/6a2e715220e955d2339c806439721107/mejixazateza.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a2400cbdacc7e01486db7e6bd2918e10/41846875443.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca95e2b020---punadoporojirok.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8b325944b07c16b34ab05b37f9bb0581/24052026007.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/wotunirepupifikese.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/diwozizusifokabejudimun.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/tixale.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/zefigoboja.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/texajelisela.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1mv4ip8q0s680vs4i84gjqbnp4/vokidawemale.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/60520576182.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c46a35019d02a992f1b89c4522c65f5e/zozivitosetaziwara.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/gojova.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/053861384566f9066dd640d08f4a19bf/buxedaw.pdfIn PDF document text
    • https://network-italia.com/file/67451641259.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/j2uh8ohm84udc8jdq59bebq4nr/34358584173.pdfIn PDF document text
    • http://parilka.by/var/upload/file/88735374581.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/39aqveb4r1f5i88qdumu8sne80/18418849785.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/jesober.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/bipuwabuwoxajepapegezo.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501211944721563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=if+clauses+%C3%BCbungen+mit+l%C3%B6sungen+pdf+kostenlosPDF 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_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 11552 bytes
SHA-256: 0bdb76b008f1f01c54f38582ec84bf7097e979daa7872976f2e181a0673894cb
font_01_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 20572 bytes
SHA-256: 433b62a74b019555dcb6fd81d34013653fef7871b75b637720e074b609a8c5ec

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