Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c524c9cd2269f3…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 13:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4bcc161412c77d7ffa2b477c6ede572 SHA-1: a012613c25c04559c799b440275802f230511512 SHA-256: f9c524c9cd2269f3c0944299377fba00f99d9708eb7548275264a186e9e6e983
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains flagged as compromised or disposable hosting, suggesting a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the redirection via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bukharaatlanta.com/sites/default/files/file/napodefajijowikadakurufan.pdf In PDF document text
    • https://tpk-m.ru/files/file/62772685869.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/tafekigupezivowexa.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/16887831708.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a913165e20---63810435811.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/fowavadajib.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/43135862817.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/99729790941.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/12063849458.pdfIn PDF document text
    • https://activepymes.com/pub/file/98766189492.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/mobewuworadapetoro.pdfIn PDF document text
    • http://allycatering.com/userfiles/95559942197.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/70826671793.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/27396345973.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/masor.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/gemosuxapoduxi.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905133430.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312e77c8472---sumupefewu.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/89231332033.pdfIn PDF document text
    • http://underbutter.cz/download/foto/6868897710.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/digelipuvuxudujisebidatab.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613175823349e---79322883784.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/64933218799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=surface+area+of+triangular+prism+worksheet+with+answers+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_off0000bccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCD 11420 bytes
SHA-256: 41b7a657d1d344505c1534712b901e620c9b54df6ee9f29272ae6f46bd4b1091
font_01_sfnt_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 16776 bytes
SHA-256: 7ad5aceefd51ef1226a838527541462027836b7ecf680a41382b0a70663a1579

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