Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bb3378fab2b32f…

MALICIOUS

PDF

97.7 KB Created: 2021-06-29 09:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1108f8ec69b86ef1d5b2dff5961a7482 SHA-1: 4bef1ce3a671df25e0651f865f86cb2b8346f128 SHA-256: a4bb3378fab2b32f2aed8be4813375a37fff581fb36fb159f45fa6e44f18d6c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ebebbdb4---31332247919.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dc8i1q27gik1t3b0k2hvinicii/99823832612.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/4462037046.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94fa446a9---lurutarafotosotutus.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6969fdd7---10573929249.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/h61hqbgcd3hvgj9s8132g2pq77/moduverip.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160870db9d1da0---20229557985.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ae25d46141365dfe1fd3c945b5364a87/59034244735.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cb77c8d90d5ea97ea04dff2a2fade8b1/85625209058.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/vasuligajomudegugaje.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bf123bedd57078ebab79b0b22c7fd85d/30189597768.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c968750fff---15768546195.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98130ba14---funosobowez.pdfIn PDF document text
    • https://coluer.ir/documents/file/loropinemamuv.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/df6298d3733d1d1b8fcbc47dad04f06e/81334362600.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/bldj02ibt3sjrfvoui3nf30j8o/48583532127.pdfIn PDF document text
    • http://airfa.it/userfiles/file/xonunerodewigu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/brculqu4splvsihopspg3smc92/pixejabitukugafid.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/56434514664.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/banukunulumuwuwula.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8ef642443732543091fbf4f8a5df677c/sodofewininuburesewu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863788952c9---41502560209.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b485b056f---melewozinavofinugerut.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a45d116c2ea---mowejomuwudikono.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097cb2d94b2f---88625675818.pdfIn PDF document text
    • http://mobiliteit.nu/files/33460503075.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/33484223895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sometimes+usually+alwaysPDF 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_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 19220 bytes
SHA-256: 852e5f7aee5d392bcfe7fb07a0d1baeb62b5c51a3a7cce81e07d62074ec02ae7
font_01_sfnt_off000147ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16006 10440 bytes
SHA-256: 61e47f9e71a45f25027340d01033f068b5a392960fc5bb33ae15f78f2c8aac5c

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