Malicious PDF — malware analysis report

Static analysis result for SHA-256 8937ada87bab0c2c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 16:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6e493fd64083d54ee4d665d024df06c SHA-1: e42b5f76760d14545fc00a2ddb03669e2a421cc7 SHA-256: 8937ada87bab0c2cad2449c6bc4cb58b266903b70f7c9dddcf1bf1b85c2fa29a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and potentially malicious, with ClamAV detecting it as a phishing trojan. The 'Clipboard command execution lure' heuristic is critical, suggesting the document instructs the user to copy and paste commands into a shell, a common technique for executing second-stage payloads. The embedded URLs point to various domains, some of which are hosted on compromised CMS uploads, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://teifsepahan.com/files/file/gemaximumazuwagu.pdf In PDF document text
    • https://newtop-eg.com/userfiles/file/62981335797.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/zededok.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/37836fd4f3a275dcfadc0f5ebc0f2409/sigutinixejikotaxaket.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/nifaxobajapodanajegare.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/92783141347.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae91d172b---rokometuxetotigozofi.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/bidekege.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202199115306042.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/10573980415.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/fetubipuvotegonurel.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/95568416114.pdfIn PDF document text
    • http://ned.ru/uploads/files/vebeliwumifokavulaxe.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/70532776653.pdfIn PDF document text
    • https://moolans.com/uploads/files/wutazoranalefuzuwirenox.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/lajikasokudekuluv.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/60804074255.pdfIn PDF document text
    • http://farmina.ru/uploads/files/88825867285.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/waxotajube.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cc59a13f986976d2b10bf7af15bdd4b8/vasamejiguwovekiwovip.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/15250940163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=install+android+apps+on+kindle+firePDF 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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 10536 bytes
SHA-256: b8b48cb0fb613ee4a4f2ae7cea838758bb3a1b81b1dbade2536b7cb1805598d3
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 17644 bytes
SHA-256: 88be0164666f86fc415f6456f936542a4b8732b21867f36427d20d2c8b5707cf
font_02_sfnt_off00011aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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