Malicious PDF — malware analysis report

Static analysis result for SHA-256 16594729925dcc92…

MALICIOUS

PDF

74.6 KB Created: 2021-07-16 14:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 478e46cfa4cf352a69d1890b013d04d9 SHA-1: a97cecc4f58381857dcbd46cf2c628090966a0c8 SHA-256: 16594729925dcc9256598f3daf506db6e36f7efdcdf00f3f099e6af8a9baacd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains a large number of links to external websites, many of which appear to be hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ketchas.ru/uplcv?utm_term=1+gbp+to+chf PDF link annotation
    • https://bd-sokolovska.eu/userfiles/file/33642326863.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/d2d7vrsn0i6klsqbu4dqutdv13/22986884454.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4996de2b6d71cdb9a20070c80def08f8/54367877371.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///10941079238.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/cd312090b93f73877a2904d492e10682/67424143189.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/55658708368.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/junedimaf.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098377a54fdd---54453913411.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/40b0502d225bbbfced7018350ca64f22/zenomakevad.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/19474775124.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609451b71cd83---sexogutotabizav.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/35401279288.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/bejudomilazugoriwa.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5ed247fa---xusugavepelamazipom.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/36369367898.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc006176fb907ababd18217b587c598d/84810230795.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kabuzixedokovi.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/49758643921.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ddq61nr1in40793kfdqivkuk50/jusazojibewevoxojogof.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b431ac702---72294932504.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607155944e322---51057995824.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/652990b4500406ff018fd15073bc8f1e/60071447031.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_off0000c259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC259 10048 bytes
SHA-256: 92f23f70e66eac14d7499120e258a4f4a2ad81f92422d07d078b955829e8ad4e
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 17476 bytes
SHA-256: 74247e0303fedc0b63b592940436e869107b199bb32cdb42ee6ff21c97b2face

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