Malicious PDF — malware analysis report

Static analysis result for SHA-256 238c97619b4ed86f…

MALICIOUS

PDF

81.8 KB Created: 2021-08-02 06:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb6929ed6a0ad9b8cc3650818fabdf18 SHA-1: 850b085fba15e1104b691f0aa346f7fa6238209d SHA-256: 238c97619b4ed86f7e5e1e27d1c41d835b2b29453517ec2e864a9579f7a2dbcb
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV specifically flagging it as Pdf.Phishing.Trojan. The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/64eb3ca06aa1c98cfa2bb398cbd83a25/zijinujoreren.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe9c548cde---buvizaboj.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/305b71371f45665d52061c087866b560/22128672362.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f753ab06cdd---foraguforozap.pdf
    • http://drshapard.com/clients/73598/File/5461669347.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a5b02bc8---66326164357.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d786d09b287---vibifituj.pdf
    • http://thevelascofamily.com/clients/11614/File/dufomireb.pdf
    • http://splogservice.ru/content/file/vasojegiwagavorazafajaral.pdf
    • http://jan-fotografie.nl/upload/files/rudan.pdf
    • http://hakkabrothers.com/userfiles/file///jejafirobe.pdf
    • http://phutungtdc.com/upload/files/sekuloliti.pdf
    • http://alhouti.com/userfiles/file/62144190866.pdf
    • http://dawahcity.com/userfiles/file/64639211325.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/lfai3b8uebo979p0e4hco2i7b7/53512844438.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bc9a5ad0bb1c051bbc72edd62c324a98/sunoboweziwujugavamukejel.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/32979961129.pdf
    • https://juhaszautovill.hu/userfiles/file/8075889056.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/610ae646cb52ad377e4216de5926461e/98291982411.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/xumupuniluduxazu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a0e733884---dojolepawiki.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608823a970b8b---68739628559.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=market+leader+practice+file+intermediate+answer+key
    • 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_off0000cfcd.bin
f915d14c78e34ae24202c17a0ef3a482f71745d860013fd31d044169018575a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 10944 bytes
font_01_sfnt_off0000e937.bin
391b5449c5d71be9c98825828603f702bd247c112dd8fca4cb785977c9c81dca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 26732 bytes
font_02_sfnt_off00011e38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 16792 bytes