Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aa83c827da95de…

MALICIOUS

PDF

91.4 KB Created: 2021-07-15 20:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11fd0f4e96d299a16b557f622ddfacb0 SHA-1: c72ad69a2d0b565033ffa8bb05f71f525662d0f9 SHA-256: 87aa83c827da95deae12e7ee244d26288ce9935ecfd3d92c4341d739bb4f261f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=super+deluxe+full+movie+in+tamil+watch+online
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa13662fb---zodizoduneb.pdf
    • https://omegaplus.bg/uploads/pages/files/21666334306.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160715dc32199d---3660521155.pdf
    • http://asja-doll.ru/userfiles/file/kalumumupuzawelonujinu.pdf
    • https://pindimana.in/uploads/file/89723259847.pdf
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/77297119575.pdf
    • http://kiavysocina.cz/UserFiles/File/45936127056.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hmau128elfj4be2d06pkb9t8v4/13611425539.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/46b7938c0b0195591db2099cb14a55b9/88779103376.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t50bsio58dl87dvpd78l7tmi51/934183386.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/70243059346.pdf
    • http://noavarservice.com/ckfinder/userfiles/files/83527730557.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210604_6CD4C6948C6F8C29.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/mefiromonigokufe.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/a71h8v91m0d28i1vb9965966c7/fisesafunisoridaja.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de93d221592---60780869940.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/412c8de2a04fc86e918e189113c75cea/pawirugodaxetijozarubat.pdf
    • https://airbays.com/userfiles/file/11270045438.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/12573730791.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e5cddbd4140f7521076485d6aa0f7c8/sebijelul.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffd6eb91c3---samorivezozunikifaxutena.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f02557c06---jabukuwisosad.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h945ospgag1tpsuu3455qab3c7/samirunabunarinefenute.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5092d564ab---murexog.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_off0000fac9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 16792 bytes
font_01_sfnt_off000112db.bin
8dc99648a86a9d0bc9ed236778f8a4b51ea42ba7ef8505cce91bf8f7b0c35cfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 18912 bytes
font_02_sfnt_off00014473.bin
ccaa8de8a817f0ab0b379fcd872f020e03d038c40b83d1ad920f8c5970924e2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14473 11144 bytes