Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec8168391309003…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 20:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7634effc1639f25c9c049592112026b9 SHA-1: b296d7bc0f33802310f834c895233251e043650c SHA-256: fec8168391309003cf05ba1d91d456974532d7626d0356172b2b821cb5b339bc
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing remote access software. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, likely serve as part of a phishing or credential harvesting campaign, potentially leading to the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://queure.ru/uplcv?utm_term=trotec+speedy+400+flexx+manual PDF link annotation
    • http://2478.ru/admin/ckfinder/userfiles/files/savoduvixo.pdfIn PDF document text
    • https://onlinendttraining.com/files/xogiwugexogin.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210621032949.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/94380245292.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/livubikom.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/zefatorixezanapawajira.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/sijiligibo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7f27e078e4869c4756e1e3a626758761/fofekoviburulikinerisafun.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a2c95961---6798889735.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/68919337223.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/71867633028.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/97417155303.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/koxivasitazudoxerifugut.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/wofakekizabigodenuwiru.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/k50pq15r16gc3k7kt0aap4gvqv/vijiwenadovufeguxilezem.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36245523298.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/abdebb3b4fb8cc1aab4e27797a14ee32/96904983216.pdfIn PDF document text
    • http://aven.su/userfiles/file/92330514411.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/18124568931.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/39002628881.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8a8d25060c9a799306a8ca1da4250761/35607988995.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/66205712809.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/839c4419a23b9dc478ddb1f5e42106f6/3444766467.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/60924984210.pdfIn PDF document text
    • 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_off0000b8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B2 15884 bytes
SHA-256: bc0e7892d7484a16d4d303d22f1157df565f0bd43fc389a9e4dfe9e38c40557b
font_01_sfnt_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 11168 bytes
SHA-256: cf739bc1462338721dfd2310834971a9dae369c3398d556e8ce621ba5b27589f

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