Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9bc66a24e820ec…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 20:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 955e2c633c05a1729bc012b79af533f6 SHA-1: 8b613780998193105851c9cb573308f5dc44900f SHA-256: ec9bc66a24e820ec9ff7cfdfb86b644f933589a4f28f18cf903fb90684b58ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mutitar.com/user_img/files/8454171009.pdf
    • http://otvorene-srdce.sk/userfiles/file/39222008192.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebc2400ed---91132961465.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/motafororogujemogi.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160855df784842---fobasujarosimi.pdf
    • https://accu-split.com/userfiles/files/9979042183.pdf
    • https://bocion.com/ckfinder/userfiles/files/72069521359.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/81c74ae91e6c6aceb06e54d6639752c9/98163853798.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/xifemugetewegopuwoxigiku.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/60ejbqk2l8lc6r23h4sop9kclh/60862025482.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf0064336a---8701786356.pdf
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/jofasix.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kenovozugekogobivatud.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/15363358774.pdf
    • https://tycoonmarine.com/userfiles/files/76016206474.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aac42b85b18---23921303010.pdf
    • https://anthonygillant.com/userfiles/file/rowevobexekuze.pdf
    • http://dezmaster.com/userfiles/file/votigij.pdf
    • http://vertinu.lt/ckfinder/userfiles/files/20778022834.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/xoguzemav.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/19qthrbksqov73ni0l06nl27lr/45319163585.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e7ec4dceeec15d85a991541a7da72dfa/pefipazukesavopul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=python+natural+language+processing+jalaj+thanaki+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_off0000cde3.bin
14a3bb202aefa82c448d7f45fea733f493255505f72f601a408fb793dbe7bdb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 17800 bytes
font_01_sfnt_off0000fc68.bin
50e8c229e786a18ee27498252d636b18ce35dd5bc089e7163106ed6158c6dece
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 11336 bytes
font_02_sfnt_off000116c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 16792 bytes