Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd48dfa0df59806…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 19:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5b8ca74f1fe0e28b7a3704eb9cddedd SHA-1: f9008d8e5da9515d6bf5f77176fd0827f5e2bae8 SHA-256: 3dd48dfa0df59806bfe9715a25d4d43cb0a49b3298df4de07ba8cba7555abb7b
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which appear to be hosted on compromised CMS platforms, suggesting an attempt to distribute further malicious content or phishing pages. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sevinctekstil.com/resimler/files/76435268034.pdf
    • https://sukhayurveda.in/userfiles/file/53479471558.pdf
    • https://lacgl.org/upload/editor/file/vumir.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/1nqoaqldqu90moaqjrlm83n4ri/jejakiribof.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/gepagimunoresud.pdf
    • http://wo-kop.pl/userfiles/file/4953554545.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace4fc42a28---ronajekima.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/9f6cd45ab6dc7d52a10f2b8d5a6e51ba/luzux.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/17b75cc5fffcfa383dc3b6d2dad341a5/zuzefujakesabagewepafog.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812c148c73e---rejifijavemipikuzo.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9f240b157---vokulos.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae208b140---12242621341.pdf
    • http://akcjonariusz.com/UserFiles/file/fasoxer.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cca88def222---783606376.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93452e559---7442142895.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/44662111696.pdf
    • http://tareeapartment.com/user_img/files/4074135713.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54fef61003---zojugokasalijadoseme.pdf
    • http://zuche0551.com/upload/file/67585447122.pdf
    • http://prota.ru/upload/files/xovajipigukoxi.pdf
    • http://pcwenhua.com/uploadimg/file/16290303631809332211.pdf
    • http://pc580.cn/upload_fck/file/2021-7-30/20210730225912875275.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/81184e429666e5f5dbc7a84770c18df4/koxebilelakifuse.pdf
    • http://agierresrl.it/userfiles/files/26893884051.pdf
    • http://capitaloffice.pl/fotki/file/34050019681.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pressure+force+area+calculations+worksheet
    • 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_off0000d31d.bin
9984ba1f6bf6b44ccd6bd2658e849d5cc4356aa3152a8a6db6b3a109c3d8d4b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 17368 bytes
font_01_sfnt_off0001003b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 16792 bytes
font_02_sfnt_off00011852.bin
fcdef47cd1e35f25970221daccf4ccdb52c291dfd52dc06f53355799c2be8861
pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 10712 bytes