Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a0d011f40e9264…

MALICIOUS

PDF

95.9 KB Created: 2021-09-04 00:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 832c0047c4c306736a23206a7c4682c8 SHA-1: 0863e8df931bf01bbf120e4dc01594392cbc1904 SHA-256: 99a0d011f40e92648397578a45993db502cf52d98bbdcfb34e303f6ce4660a1e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and link distribution pattern are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085374abc8b3---fepezaselari.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f12f3b344---41269912594.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/rapugadezulu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/20e6uolpht5juh17o0rohtp8o8/65232352475.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/rojuwabefi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ddd9c4c9d---23247768203.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/wapakela.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/84520339718.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/19026777133.pdfIn PDF document text
    • http://kesifveotesi.com/files/61722771102.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/76288685926.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0da12c46c---kigopawijezegujeruf.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5beb0ccb72---jagisemulawufudejefuxibo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611652eb68dcc---22445060290.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/90936744673.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/jugesadu.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jafesabepumalenobegubini.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/527bc224328eb00660650f1362f5e2e6/42046430091.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/jujozorelewironotul.pdfIn PDF document text
    • https://campermagazine.tv/public/file/debixuzumoj.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/tatosilepuwijupowepi.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/tosunurexufivubufegule.pdfIn PDF document text
    • http://nature-revive.org/files/file/65205538275.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeeced92be---sirufaserixukawiro.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/dexos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=manualidades+de+navidad+para+ni%C3%B1os+de+primaria+facilesPDF 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_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 19664 bytes
SHA-256: c0346700fe0fcdff91a2ee7d61976fb396412074a04ae7463eee98e4fe9c5f30
font_01_sfnt_off00013d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15597 11048 bytes
SHA-256: a050b6e401458225ab69ca53167bca92878e72387771b4c0e24ce1c54002daa9