Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba87093618638930…

MALICIOUS

PDF

78.4 KB Created: 2021-06-27 02:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 898ddbc6c9415cc0e7175cdd9148535b SHA-1: 13a3df39bf403687f7643c6f23e70b454304c929 SHA-256: ba870936186389305242640ee90588fd3c03092819c26137c6d863622d0b7623
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure and embedded URLs suggest it is designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088161176733---12805967191.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/903aq7mhsmn6huaokf1cpqg5sidcd81r/jigonigalo.pdf
    • http://sarlampa.ru/upload_picture/kanadiregafeluzesesuge.pdf
    • http://umrllc.com/userfiles/files/64730200823.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/tetujojitifapikisovepeviv.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/97d692ff6511f81e5b90a603fb4e0b12/xubebefawoluzinatawuwu.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/072ac9da0950b024fd75a4bc37a9ae75/gadumalozuwukatunigufavu.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/79553653295.pdf
    • http://ehoron21.mn/uploads/files/1801663636.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/de580ae5601d09f7710f081c926f6621/kotixagugezetonafoviluwem.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bba247ed0---sibutumepa.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/303b04446a70cfeb289c0d57b33985de/fugatuzozujokagiw.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/volonatepaxomuf.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b76072fe657191151d56ebe613d2824f/vifiridutajagipuze.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/wekakamubep.pdf
    • https://parklanehotel.asia/userfiles/file/32144075523.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa5ae6438---luralixojexidogajakiro.pdf
    • http://kleiberit.ru/files/file/53342059353.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e36e7a6ad1---58656571021.pdf
    • http://www.contectrade.hu/fckfiles/file/28831852653.pdf
    • https://divinenine.net/userfiles/file/60109472207.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607431f449aaa---sabonofazusepukenaxux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=double+pipe+heat+exchanger+overall+heat+transfer+coefficient
    • 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_off0000ce47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 16792 bytes
font_01_sfnt_off0000e659.bin
91381ca9c968df9c5812a938d738ce515d6d271b78dba22bbd7c99ad13923126
pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 16836 bytes
font_02_sfnt_off00011227.bin
7d7728fe5f6931b51e1679f7e97cbdab9b71b84b8281e2acfe15ffbb99dd4d51
pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 11168 bytes