Malicious PDF — malware analysis report

Static analysis result for SHA-256 6856460c5514d5cd…

MALICIOUS

PDF

84.6 KB Created: 2021-07-16 15:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c842d61d41b122bec57b51e55444859 SHA-1: fb900e3e85e9d781edd1ed2cde6ffcd242a49e29 SHA-256: 6856460c5514d5cdfbea9302ab6033ebbef4205b141e0b0f6ce459817c306c8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure and embedded links suggest it's designed to lure users to external sites, potentially for credential harvesting or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lavalnerina.it/userfiles/file/90702895489.pdf
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/4ced3672f6731f52b4523b832c57ced2/fojupukogigu.pdf
    • https://infrastone.com/userfiles/files/pusakafe.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/82420cb3de7130cc042f74be4ee236e4/14967507091.pdf
    • http://accronline.com/userfiles/file/jodetesebifubosepivewasuv.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/41668866141.pdf
    • http://artospace.com/pics/file/95425314962.pdf
    • http://skupka54.ru/upload/m/21021715654.pdf
    • https://eqonetech.com/upload/userfiles/files/taboforu.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c2e7a3aa845f0e9aefc74c79d2d32982/59068733596.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/234f964ac109f154c11a5da2991730a8/pekurexinigiluf.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/22orpu5bicvoibgkqfkdq738sd/webozejadivumakexut.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d4ea123dd---64585473451.pdf
    • http://maduraigarlandshop.com/userfiles/file/46534724804.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb4677530---xazivopidajowem.pdf
    • http://areaarchitetti.com/userfiles/files/45647978764.pdf
    • http://aircond.md/upload_fck/file/15506572525.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1795e096c6---wufezan.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/98107986360.pdf
    • http://mesterek.net/tmp/97531032229.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfd267fb5---xegisipekedimodopifopi.pdf
    • http://paradisetnl.com/FileData/ckfinder/files/20210713_FCBA8DCC0D96F85B.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/0eb8d8c9f717f05594f5b1813cb29806/54534412798.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=compounding+of+polymers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e643.bin
c6bca42ebe31f51a4a3b83129f9f36783a9f3650ed46c7402603e8df6e575eee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 10824 bytes
font_01_sfnt_off0000fef1.bin
c77de9b3d75f4cc9ac662536ca3c72c3dd204b6526cff833738378e946fe6de7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 17616 bytes
font_02_sfnt_off00012d56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 16792 bytes