Malicious PDF — malware analysis report

Static analysis result for SHA-256 558ab78161448a85…

MALICIOUS

PDF

90.0 KB Created: 2021-08-20 21:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0aa397ae21d23e4aea010abfd4f6e80c SHA-1: e7546a99fa03129d3df56b6fb2ce04e07c609a3d SHA-256: 558ab78161448a8505765b2a928e5f42545d1f7ef9c7388490f7835a580505fb
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates a social engineering attack designed to trick the user into running a command, likely to download and execute a secondary payload. The document body is unreadable, but the presence of numerous links to potentially compromised WordPress sites and other domains suggests a link farm used for hosting malicious content or redirecting users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e07977d53e48b373470fbe6f2a3abc1a/56120517850.pdf In PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/31504746764.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/jovekek.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/53322512629.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef800889f0---xulilagekezeg.pdfIn PDF document text
    • http://chongros.com/userData/board/file/nusafan.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/31359467042.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a2df09855---fodekubinifinozogiwolojeb.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca144ac45c---21425340716.pdfIn PDF document text
    • https://onlinendttraining.net/files/98163807597.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/89463850233.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608693b5bcc87---tonifigisivofavan.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/kapupixokore.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608674034a4dc---66112938979.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/03e17cc9ab6115b057e584e1a9477087/24539313698.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/lc5n7caiq7g01135s9acplsu77/45137595368.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/kelivopomamavobameg.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cbe1fedaf972ce715da4398836aa597f/24773774184.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1238c437dbbdc091501680a41ada8dfc/55036859100.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/89258005934.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/93761256532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=camtasia+studio+8+portable+full+megaPDF 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_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 11216 bytes
SHA-256: d2762f3f0ccfda89586814ec093cef402bb10064d2d6969336a788cbd8171d14
font_02_sfnt_off00011eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 28908 bytes
SHA-256: 285cf3b5d1b8bde135f3d3ab7b03dfa8e16bb07e300cc8b8041fafa7c909a552

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