Malicious PDF — malware analysis report

Static analysis result for SHA-256 94335b8ddccf6411…

MALICIOUS

PDF

89.7 KB Created: 2021-06-26 13:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3594351f39c22331909af71f688df3ec SHA-1: b470db37657fbfda641c5d1c1c063de8524c98aa SHA-256: 94335b8ddccf64111c32eba5d526c984a8403c4ed1627918e45314cee4a0b79b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely to facilitate phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee6e7d626---34385774217.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d9c5a7e9b052bef5004574dd8b567435/38227153158.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b453601aab0---lopoxugalimupo.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6318198bfe---65965822464.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab698949da1---9237608981.pdf
    • http://weberstellen.ch/userfiles/file/lepotimakojavafoxogox.pdf
    • http://ibb-online.ru/f/file/8918734201.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cfc66ecda---kavovam.pdf
    • https://go2germany.ru/files/file/nadixoruzixejulunurewab.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bde0e487b---kokozunowarug.pdf
    • http://hndgyl.com/v15/Upload/file/2021624232537701.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/1060ef1d4b75c578af749da9299840bc/89414618528.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d07bfaa4dbb---ravasevegeg.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d64b648f---ritovar.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e50b6c75---55259601427.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/76odlakirchgsh20rusohdulu5/54034663824.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d62359961c262babeefe47146873e2bb/5631592698.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a17f851c9f63be6e8c671e3f1a1ab86e/damivavirowimi.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b334f8e45ac---14806561610.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/78773923255.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc3f43e37---tedevesazilipag.pdf
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/21943098965.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc6616f77---64946972277.pdf
    • https://arhometutor.com/userfiles/file/tekidatubererovobipomo.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66bb94b2e---ritirebedevexularuxuta.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+turn+the+voice+off+in+minecraft
    • 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_off0000f573.bin
a0798f15eceed63e0ad1f04ff026c1c08fd92cb8ec5eefd87630cb2be7afb2be
pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 10884 bytes
font_01_sfnt_off00010e70.bin
415d449ccb2daa6b5e632922ba81fee4a9b1fb76a93a5dc58612800ed7339258
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 19932 bytes
font_02_sfnt_off00014121.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14121 16792 bytes