Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41c0000a3d0fbe8…

MALICIOUS

PDF

86.1 KB Created: 2021-07-29 12:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60d261597b951828086dd38dfff57712 SHA-1: bb387046e368a48d06257e41eda3a3771aaaa9fd SHA-256: a41c0000a3d0fbe8a3ff2a7bcb23f74f6897f92e3ccbb170c202cbcdb32ad893
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a download button lure further supports a phishing or scamming objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sunpower.lv/ckfinder/userfiles/files/18023807388.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7dcf92f3bd35bfe4ece587a065aa0d2b/38675439373.pdf
    • https://mebelihome.ru/upload_picture/44140130640.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa4b0cfdb1---38424881985.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/28565c0ce6d5393b2ab9a94798e900c9/wogefenopirakonedi.pdf
    • http://romanakladatelstvi.cz/userfiles/file/zapibawed.pdf
    • https://osikovo.eu/webroot/img/content/files/wutaro.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ed881833cb7---dijanad.pdf
    • http://ajivikafinance.com/userfiles/file/51945307779.pdf
    • http://roomyab.ir/basefile/roomyabir/files/98651043833.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7600487b4ee87126aa06144aef24df05/60390081745.pdf
    • http://absolutelyneon.com/userfiles/file/70669384986.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/52036741885.pdf
    • http://edumedcare.pl/upload/files/xikakusize.pdf
    • http://vijyaiprismcrm.com/userfiles/files/70699164893.pdf
    • https://ddshower.com/ckfinder/userfiles/files/dixizakezi.pdf
    • https://baoholaodong24.com/userfiles/file/tadafazifixijijifozitis.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vodi8qmdhqgfctdetncab7c9cb/fuzowupezupesegigegek.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/38817788576.pdf
    • http://fixafilm.se/userfiles/file/xekipepivaliveponidezili.pdf
    • http://agcslohian.com/userfiles/file/59054404623.pdf
    • http://mevlanaasm.com/resimler/files/suzukujiwexarenamoxogun.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5f224400---sewef.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/daa8bfc5edd7e974db1a6281aab426ab/94307359114.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b545be0ce1---67438594668.pdf
    • https://total-sport.pl/img/upload/files/10760866752.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+much+oil+does+a+scag+tiger+cat+take
    • 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_off0000ed22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 16792 bytes
font_01_sfnt_off00010539.bin
1521d23da505bfa35fe949333ff038178263a6625e63f62bae07fc205ef228ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 10980 bytes
font_02_sfnt_off00011e8a.bin
ff2da843233fe2d91c6763d1eb87a24bad9a2d7e1c8c59575846c0f823ea57bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 16784 bytes