Malicious PDF — malware analysis report

Static analysis result for SHA-256 a326f8838fd0a58c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 00:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c029a8adb8b45d9af4ee9924ccbde5ae SHA-1: f3d2e68be0e35e86efa8a47685e25d1116b06bb5 SHA-256: a326f8838fd0a58c891c06f05ea10a1b8db81d208dc3865924eb5c76e7fd1f61
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=taptap+apk+download+latest+version
    • https://navoloki.mebel18.com/uploads/files/lesuzorekexexatoxarozal.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/46115919133.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2102873476bfab5b9ba2229627c4eec8/47340339922.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/66927350689.pdf
    • http://homelife-superstars.com/image/files/dosepimodafufutakuvuxid.pdf
    • https://karapinler.com/calisma2/files/uploads/51814223949.pdf
    • http://bajkolandia-leszno.pl/userfiles/file/53319541146.pdf
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/kijamupu.pdf
    • https://giltmorestukko.hu/ckfinder/userfiles/files/kovare.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405ec6a3488---mazavewavar.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614172c2f35f4---25474213511.pdf
    • http://nuuts.mn/uploads/assets/fojobimafinitagupejosipi.pdf
    • http://ets-sptk.ru/pic/file/20712952249.pdf
    • http://mg001.cn/upload_fck/file/2021-9-2/20210902112724722663.pdf
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/72507797500.pdf
    • http://osmed.cz/app/webroot/files/files/79454455098.pdf
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/zejugedati.pdf
    • http://khojedu.net/userfiles/file/zabita.pdf
    • http://ventensis.lt/public/ckfinder/userfiles/files/56547876927.pdf
    • http://teakdeck.pl/files/file/kitagajigefuravesebo.pdf
    • http://jedwines.com/cmsCart/upload/file/lizomoreritase.pdf
    • http://heaig.org/editor/ckfinder/userfiles/files/xigegibelolusedeges.pdf
    • http://www.focitabor.hu/userfiles/file/xijibelaxitutomafi.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_off0000d27b.bin
9b486ad15fe64d430756273648896defb0e805e7726bcceaac74c9fd501a36b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD27B 10592 bytes
font_01_sfnt_off0000eae1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 16792 bytes
font_02_sfnt_off000102f3.bin
027a2f196d7281572dcca1d1145b122118072fcc5ebe2a9a8650c4cb31923c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 17868 bytes