Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6262d32a293c18…

MALICIOUS

PDF

85.2 KB Created: 2021-08-15 20:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a532c28182492480c68968aba06cde7 SHA-1: 6857ff1aa4faaa9e4a1d1fac08a90c4d0bcdda16 SHA-256: 5d6262d32a293c1891b007befd9861c54c0fee84346bfc470888c5787071689e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://z500.si/files/vufozufo.pdf In PDF document text
    • http://fertilityupdates.com/userfiles/files/riwopakisobage.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5f101b88---gepotoxedipebisiji.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/89816261768.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/538143c314c00e34ce4b2be49c7df061/72519672582.pdfIn PDF document text
    • https://estoniapools.com/contents//files/57918903420.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/229683227848c7014b39822fbcd3dd79/3215288886.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/miwesoparulon.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2f2343a1---wofobizadetevaxiteru.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f240a9498b7---xiwireweretorudomubigew.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983d51dcb95---10488154660.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021073001241724699.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/65f641abc257b7646e9ced342e14d72b/44611873391.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608494f27745a---8469531296.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/mubazasodonixademikux.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3b85cd83e282c49f4d179ca4f8033606/91992514693.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80335e52e3---70165962734.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/19405042111.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/77393755977.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/78938233173.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f543c7530a081a229b08634474d963de/75489390364.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/82858426380.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/lezopajafovafiwe.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a5da33ae---zenedefamenuduf.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/xogabifusegoralusuwotun.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/zosetupinufitiguzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fanaa+hindi+full+movie+watch+online+free+youtubePDF 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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 17000 bytes
SHA-256: 2eb5a6259b1c4c4b5fd8e12b7fc423a2da1a2c3407d88d2185f9e84494ae0da1
font_01_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 11056 bytes
SHA-256: 4ac38163872509ef0cf5b6152d4e53f596863aff79b8e9307fa6475790ea1ede
font_02_sfnt_off00012ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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