Malicious PDF — malware analysis report

Static analysis result for SHA-256 911809e6a1b8355d…

MALICIOUS

PDF

89.2 KB Created: 2021-06-30 19:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f88c506aa454d83521ba78165bc1f2b SHA-1: a8f9cbc8597f437e74dd269a5df9797d2569333f SHA-256: 911809e6a1b8355d07bc66a8a1e573754996cd1170af171679138aa953d92546
236 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm hosted on compromised WordPress sites, and importantly, it uses social engineering lures ('ClickFix') to trick the user into copying and pasting commands into a terminal or the Run dialog. This strongly suggests the document is designed to facilitate the execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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
  • 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 http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/49vd44gu90unoiil6k9mqui5qs/rifejokavogovomadufuf.pdf
    • http://bpabv.nl/uploadfiles/file/siwemesupex.pdf
    • http://phuwangnam.com/user_file/file/wimexisovodo.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b097e1544d7---lokidorobirovubuvum.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/15i3pf4mua6h4dc83o7ae1apl0/dinerifezenirokidenitofo.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c2bf48a78---dufukefutomuxofonuliv.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a3b313045bac17618ce508a6943da98e/66343278327.pdf
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/76005249152.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d7b4ffff7f95732ff035439fe660fac0/rapamadajenajufu.pdf
    • http://fine-cottage.ru/userfiles/files/bufudibez.pdf
    • https://red-adlay.com/upload/files/81096105684.pdf
    • https://area5srl.it/file/suwixaludawikade.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/58f97d95c45ad99588d76e136ab0cc56/wagiwire.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc25541a3c---jeverowa.pdf
    • http://megat.pl/uploaded/fck_files/file/41462451288.pdf
    • http://barnesfamilyre-union.com/clients/52050/File/69044095948.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c43ff06dc64---40397796917.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084066e9a83b---dalatodepozurogidasisam.pdf
    • https://agrilaui.com/userfiles/file/6488019909.pdf
    • http://envigest.cz/upload/file/37345536852.pdf
    • https://corpusbg.com/files/fck/file/matabuzak.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/fa47431dfd2dd086dcc9171a0cb54bdf/kejazuguwuneduvulunera.pdf
    • http://jrpst.pl/userfiles/file/dazanuwojarirawejik.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa9cc6def---68729399372.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806b7758749---zurezuguzabiluparuxip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=no+operation+can+be+performed+on+local+area+connection+while+it+has+its+media+disconnected
    • 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_off0000f5c6.bin
f8d004131341e5310ffe9ef40bc9481f74ad893984c149985c0d40bdac476c60
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 17188 bytes
font_01_sfnt_off0001227d.bin
fe82a4de08d263a535d7549cf5176bcffbb1b144c97cabd2058a8c770c826651
pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 11088 bytes
font_02_sfnt_off00013bf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF9 16792 bytes