Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4394b41ec91fb0…

MALICIOUS

PDF

93.2 KB Created: 2021-07-15 10:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e94c96845135945c0feb4fcb3c12a620 SHA-1: 6f7cc446bf4457939cbcfc974c68008bd0c6b600 SHA-256: 0f4394b41ec91fb06dbb31f5d978fdf0ec219e1c5435ad6613958e17f8f4d856
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous external URIs pointing to potentially compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/qm2ifr0dr0acbpvdt1gjj35th7/lapadaxiji.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/430f6ae228127547f1bc7ee4a8611326/10154749320.pdfIn PDF document text
    • http://moristas.com/userfiles/files/77538858111.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/lidodubovusixugi.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/silonipewutoxaxox.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f83752560---zulumefaguxuju.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/93530120569.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e24256f6---25922902148.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0f478903a5ccbd47b7d1be6e318d7950/sigojaxavimu.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/vapodoxovogurabutupove.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/limuwamidedopopurosazegos.pdfIn PDF document text
    • http://naucseto.cz/storage/kefigipu.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/61207410988.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc28bc57a1f---ratofokomu.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/4mplejv9eqq732g5h31b3g1533/23395108330.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf07b504bf3---12552202406.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/6ug3p9k3a72fopp4kp7ucjjta2/16643249696.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/35356618456.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/37766393641.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/jepagorif.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae25749ad---17153717326.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16094045b63c4a---11418630410.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a80105c45---lowobukakis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dissolved+oxygen+in+tap+waterPDF 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_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 17032 bytes
SHA-256: 041db5c6ce1fb47e86f40af56c38d62519ffaf33660855f2bfe0b803f93215a7
font_01_sfnt_off000135ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E06 10936 bytes
SHA-256: 6f73ca36461af1cfdb5c4bf7427ba4986c0c7765bf8bbb7fba70ed49122dfa3c

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