Malicious PDF — malware analysis report

Static analysis result for SHA-256 8604ee8d9c1be6ac…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 18:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1acf09f1c8f8ec5e8d8fcca2d6217a41 SHA-1: 866e25655e3fc9d9f3e3153f69fa1b337355b258 SHA-256: 8604ee8d9c1be6ac6b8f51e4932c3c8c0fcedd0bc2011d2398ce94279399ea2d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a380edc1a1---35157306428.pdf In PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/jesosabatazewareli.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/luwafuxegavef.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75686a9f0e---labizep.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/voxotevibokaxiwi.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/8726741236.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/77635602688.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/80562731865.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/38542855553.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/63276551350.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1265fb8f36afec42391e638779846394/70827180725.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/37536481694.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106141815288573.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/puzolemanub.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/96946951618.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/boxob.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/woditoz.pdfIn PDF document text
    • http://stylekd.ru/files/98559909215.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072805489ebf---70000877657.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3bfddafd---kuxofopudenulekujikewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=getselfhelp+unhelpful+thinking+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 10628 bytes
SHA-256: 291be2ed41c47a36ec4055aef206b462ddb53a7db57105dd841f1438ae41699e
font_02_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 17324 bytes
SHA-256: ae0542d90394f47534c15a3a1807ce1a42d4b4f3a448a8dbba064d6da7d98b37