Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb582a4b1353cfe…

MALICIOUS

PDF

88.8 KB Created: 2021-07-20 23:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab413d23757b859274aefdfbc5dcdd63 SHA-1: 48d9df434f34e81f0028bee2d74da6318bf932f0 SHA-256: 5bb582a4b1353cfec0bccb089d02ae37a14b864fa71a615d4029c3c8022dac6d
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 detection as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates the document likely attempts social engineering by instructing the user to execute a command, a common tactic for bypassing macro restrictions. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2fb17f0496c1026376264db6c5634732/42232165171.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ff8443ff87d311ea8463be8da70636af/18578615257.pdf
    • http://omatsuri.kr/data/userfiles/files/14637836783.pdf
    • http://hiredriver.com/uploads/assets/files/62632600167.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/4f1bc23a573e199420b51f823b35dd1d/xijujesesur.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/831f7fcc8a87469fcd94051793e46efd/7641547228.pdf
    • http://gramercy-grand.ru/files/file/rapolixajif.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b619802c---jesig.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42f9f1780c---35651328735.pdf
    • http://matsonconstruction.net/userfiles/file/radupevad.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/1d6c827e2b68a1fbfb24814b2f449137/26259340714.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/37264872484.pdf
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/naroxegixa.pdf
    • http://photou.cc//ckfinder/userfiles/files/vilukozenekajoxurenowil.pdf
    • http://aimic.com/userfiles/file/80620802575.pdf
    • https://qnzar.com/files/sokojabekefaxurotuf.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5fabdadedb0aa553f04940d6a31821df/34796500683.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d434ebfd544410e305754fbd50fb6678/relefofuzisunijo.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abaa01d014d---gesulimutawelowukarumuvu.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/096922f358b63b236109d8643b8a3437/32761284454.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924faf399c1---22863787354.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/29271109798.pdf
    • http://abwjefferson.com/uploads/files/81678736467.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=spooling+not+printing
    • 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_off0000f7f3.bin
ab047e0969dd0649ef62ecd3776235e2ec9c05cb58a50577e6062df8cb867174
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 10040 bytes
font_01_sfnt_off00010e4c.bin
6a4375c013100d462088e636e761100854520711e96ea29edd241a782b7bd130
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 18160 bytes
font_02_sfnt_off00013e30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E30 16792 bytes