Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a39a1cbd662cf28…

MALICIOUS

PDF

145.3 KB Created: 2021-06-30 15:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a831d395b96f51872b6f393fd83217c9 SHA-1: cd9f23dc35cf5340389d71e1782615da11f32994 SHA-256: 3a39a1cbd662cf285de9bc3d3a33a6a6965b57a7b98885f0f62b897d73e16912
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host other PDF files, indicating a link farm designed to distribute malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's purpose is to trick users with promises of prizes or funds, a common tactic in advance-fee fraud. The ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://coretry.ru/uplcv?utm_term=american+national+standards+institute+ansi+pdf
    • http://dochoiotovn.com/uploads/userfiles/file/nasosobawililujisem.pdf
    • http://candientuvibra.com/images/file/bevogaziditomu.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/16660936d886fe696b5e6889176ad5d6/29089913652.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838266f1696---16839175505.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/97715156019.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0cb7791ba---wiferipubutumof.pdf
    • https://ratsimae.ee/media/contents/file/wizeg.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/19116136837.pdf
    • http://nadiadsa.org/userfiles/file/tarobadojedufudipigido.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d95d7f81d8be8ea7b9a682a48bfb908c/vusuleralan.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4459a4ca4f89b3d20af62816bc231ac3/sujifedufij.pdf
    • http://omonetach.pl/foto/ilustracje/file/duzazes.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3cfde0b1e---20483750729.pdf
    • http://szsahsh.com/uploads/files/31597991506.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f56790811cf22819f9b3c766e54aafe3/dajig.pdf
    • http://ypdtools.com/ckfinder/images_store/files/73785023087.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef07e3e2d---11755525742.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/22sgi865fh2paekafg0i4c5s08/mojetovumikijomoti.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96f952dab---5621553826.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95ca57936---gatuduvuru.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc681c8af1---88147509701.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8ce8f380fc02ca963bb7cd5d67cf5ec6/77017614000.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e8794d86dd1a2c76e78a9269006a8aad/12014583510.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_off0001d5cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5CD 16792 bytes
font_01_sfnt_off0001ede4.bin
e50c0b908c9318ad4a6b82ce6ad4eceab93947ff95b9eb3d6dbd4548fa1f68e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDE4 10864 bytes
font_02_sfnt_off000206f0.bin
e587ce5a430e7c5e560b1399113ce21d6d7a9fbfafdd7d2926e325f2e5d79b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x206F0 18156 bytes

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