Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0788d6f9adf1a8b…

MALICIOUS

PDF

90.5 KB Created: 2021-06-30 13:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c13da61e4dfa2a6bfd1c4f8e3e38030 SHA-1: cba850b6a1108e9a59448b42eaf438afd2005134 SHA-256: a0788d6f9adf1a8bbe636761e533ba22940352b2d7b184454d799a18bc2bf805
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 a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c057d1853---71238966753.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d610a0c1f6c07d3db4319ca08ad3c35b/zipotunexadeguzodev.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b8524ccf76b---bazolegesinitubuwafupet.pdf
    • http://ankamet.com/userfiles/file/sotomalifopevijonopote.pdf
    • http://alituncer.com/userfiles/file/71943603486.pdf
    • https://netshopnepal.com/userfiles/file/juburovubibopo.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf425a8a8f---92466996081.pdf
    • http://mobilni-kadernictvi.cz/files/file/bajajekirivekuvivanedux.pdf
    • http://staresecurity.com/userfiles/file/98573881657.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607339a146752---zadovodetatanuxajuboluja.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c395c000962---88108697315.pdf
    • https://soechi.com/userfiles/file/82039184948.pdf
    • https://tavio.ru/files/file/gebixiberafoder.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/aa2b26e273ba9d601c7c77d711e96d46/56966001300.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6258739e3---xifekenovesapopugarun.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9c62a12a14f741f479395e1aca3c1c58/fasazepupirevorugazumuza.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2499aefabd---32052587174.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a84024fc397179815219bb50b7710e09/58364453676.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/53700nh7kn8954r2q88o5oiem9/41542236751.pdf
    • http://edu-family72.ru/content/images/uploads/file/fileguwekupisilojoporosuj.pdf
    • http://ventilatoryzlin.cz/images/file/5271798000.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce91a05acb---41280596576.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/xejibibebubonatafo.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/75ansdh4i0jmpju1fod5hs8o0t/47062287960.pdf
    • http://aldo-ins.com/userfiles/file/45005776674.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ea8f1b77---kukerodozujewabavafubel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=iphone+8+ipx+rating
    • 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_off0000f25f.bin
415b5ad5ddc237c0507fbf6574d1a57a8c78748e2afeec8d215e056d890df844
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 10576 bytes
font_01_sfnt_off00010a7b.bin
7bd03c361172a85c00bc6b4c110b902900e3ec3e022bbd5a73e661655e4ef5ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 28424 bytes
font_02_sfnt_off00014338.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14338 16792 bytes