Malicious PDF — malware analysis report

Static analysis result for SHA-256 c132c58ae40b89b0…

MALICIOUS

PDF

100.0 KB Created: 2021-06-27 07:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f10296842450e02b0b8e44c11ac28b16 SHA-1: c174cfa71270d7a070b402c2577cecf01697bd82 SHA-256: c132c58ae40b89b08d94604dd9fd9df19d0f5345e96e63f70cf08cee827f9aaf
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. While no scripts were extracted, the structure and URL targets suggest the PDF is designed to lure users into clicking malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0a16f8e2---8501511176.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/v5orsf44fgb1q3116u7t1skunr/begiwajilamed.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c5e35b367---temezi.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7ktbni2h2ua6im99rqtg25rp48/65467375029.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7fa3e1cfc31e66e9d565be618609fd49/lonujibivabezaluwuli.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210627075030.pdf
    • http://instandee.com/Images_upload/files/68304798038.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b0f89ca4a2b13bb32fb097211401a07/27086427251.pdf
    • http://gorisum.net/fckeditor/upload_file/file/5012284313.pdf
    • http://resheto.ru/users_images//fck/file/berakotomumofekarox.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d3b0369eb---31905175664.pdf
    • http://nature-revive.org/files/file/62311444680.pdf
    • http://nguoigiupviec99.com/webroot/img/files/65807262412.pdf
    • http://icmasistemas.com/userfiles/files/narujorimodorajarafuk.pdf
    • https://elektrona.cz/files/file/mesozin.pdf
    • https://nestuby.com/userfiles/file/xulevuxusamageloxosenu.pdf
    • https://ketdoanbus.com/webroot/img/files/fubadubezelupav.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794fe84f10d---19777821998.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/790a1954c2f854d9cca2937545e47012/votuwovo.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e9928ba95---74674345018.pdf
    • http://elementsgogreen.com/userfiles/file/genizonobirinimejutejulo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=650+grams+to+lbs
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2b.bin
341ca4069e38097c7122af9a32019bc697b14041e81873abcf2ab8c63dbbe072
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 23892 bytes
font_01_sfnt_off00012153.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 16792 bytes
font_02_sfnt_off0001396a.bin
54b775f5e851efc21e4188f1b2564cee57749d7965c3da1ea19a1eb16a07538f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1396A 10592 bytes
font_03_sfnt_off000151a8.bin
75b01ae23261d3296dfdf6e63ce25842f1003d4b4e881c2f4aaa4414478dc367
pdf-font-stream PDF embedded font (sfnt) at offset 0x151A8 18052 bytes