Malicious PDF — malware analysis report

Static analysis result for SHA-256 0728e4993bc1b195…

MALICIOUS

PDF

86.3 KB Created: 2021-07-23 02:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89377ce070ff05b58538fd061c3dad1a SHA-1: a7ae5ffcfc37bcf9e70ae64cde92fa0188e593f4 SHA-256: 0728e4993bc1b195f33f9da1b84f86155bb2b8f6c5ce0298125d8dedbad12a3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/5aedb45f7d74f2cbb576ce556b878cd1/57953105969.pdf
    • https://balaji-technology.com/userfiles/file/vuvogexepag.pdf
    • https://alves.bg/ckfinder/userfiles/files/52207717579.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/df766e2b204c88f273abe45977b64506/xosixagumu.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/50587560785.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafe653872---pojibitewi.pdf
    • http://romanakladatelstvi.cz/userfiles/file/17494704647.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d5f81d64f0162d4ef1629e46a8773681/weromokedumanele.pdf
    • http://samuiluxurytravel.com/Uploads/file/losanugufo.pdf
    • https://al-farh-iq.com/upload/userfiles/file/5782214926.pdf
    • https://sakkestadbil.no/userfiles/file/5306405438.pdf
    • http://4seasonstours.in/userfiles/file/xupedu.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ed28577c5---mitipelenopojulalukudek.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b4a722ae2755fbe2d837fea5941e2b0/xajewisidor.pdf
    • http://amandatravel.com/userfiles/file/bidotetu.pdf
    • http://supermarketdv.ru/files/file/91844421237.pdf
    • http://beiwendq.com/userfiles/file/22413370183.pdf
    • http://metabolit-plus.ru/files/file/14382499114.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/tereguw.pdf
    • http://au-coeur-du-temps.com/userfiles/file/legokivikaxamonatobemigox.pdf
    • https://tavcam.com/upload/ckfinder/files/3538732886.pdf
    • http://efuegypt.org/userfiles/file/35688669032.pdf
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/tofazokilozizikujolixuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=values+and+ethics+in+business+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_off0000ef5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 16792 bytes
font_01_sfnt_off00010771.bin
186b0795eef7b7f8d89effab801cd387ee4e8c2675a1d935fa3d7eb15c5849e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 16552 bytes
font_02_sfnt_off000132bf.bin
7c20e0132205cf16544d3fea4e67e3a0dcb878a4677628d2dffc1074a62ac0c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 10704 bytes