Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc216204a404110…

MALICIOUS

PDF

93.5 KB Created: 2021-09-01 05:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 915f16677da1d09c6e12777cbee8b25f SHA-1: a2806437b092221b7c68a0534c2e50ca2c9385e9 SHA-256: 6cc216204a40411015247864f15fa38fa5929578642911cece5061ebbe19bbd8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. 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 0.9937

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://studioboscono.it/userfiles/files/59029005399.pdf In PDF document text
    • http://guowangcable.com/d/files/magusaludatamonabuf.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/75590744721.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c80206251---36856531631.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebade847c---mojusidasuw.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/18749999051.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/taguzopililelafifa.pdfIn PDF document text
    • http://goldmustang.com/files/files/70586600495.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/fozumusagulegozexisi.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/bopipof.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/17413105723.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5612b9f19ca61c0859521f4d115e49b8/27891608355.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/rabetonani.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zifariberikoleneredage.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42ef5d613---kolosajinef.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609274205deac---zopukiwo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87630dd1f5---radisetajogarozaku.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/3f99cn3ggs0pvapqjjpl12f0i9/penumedodudifo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5f4638d7d36c9fefed3826c232143a54/matojutumarebuxizuli.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d6ca71faeea7dc0f4a30c3d7621037ed/binawivuxegakuxunufasaz.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210618022306.pdfIn PDF document text
    • http://arslanemlak.come/file/muwijukeludez.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ep461nrgj5683tqhvtt8s67pe2/zaxixiseb.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5773d59bc---38217069790.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/jubamolulopuvabus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=meiosis+worksheet+chapter+10+biology+answer+keyPDF 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_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 11252 bytes
SHA-256: 34dc00651779ba3428599bd58e869a059cabd12ff6e41b66746ac8e8cfc88eb3
font_02_sfnt_off0001373c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373C 18800 bytes
SHA-256: fae87a0a1fec4d7d872717e4f6fdf6542f1902811b9cef8a873acd948a242206

Open this report in the interactive analyzer, or submit your own file for analysis.