Malicious PDF — malware analysis report

Static analysis result for SHA-256 588fa2bfae296e8a…

MALICIOUS

PDF

84.3 KB Created: 2021-06-25 21:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8b60d1b6ab2b8aa29e352808ec1155a SHA-1: 63f42c31900a70d83e83f8d8b616692abe401454 SHA-256: 588fa2bfae296e8a69212236baf360b65363cf6f57fab426c00bb96b4454f261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nasikampung.info/contents//files/56932152652.pdf
    • http://icsbc.ru/fuploader//file/bimeseguwupunemom.pdf
    • http://www.lnk-creation.fr/upload/file/guzilemevuwefapubuwug.pdf
    • https://agentcctv.com/userfiles/file/tegenirugexaxunojolu.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160705a7c8b430---vomaxuniniwapir.pdf
    • https://aravlicraft.com/cmsCart//upload/file/vizokibig.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/37ef98f459b9f8e9588a32dc51135387/90663261126.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d7b64c05b---53911134166.pdf
    • http://iviltra.lt/images/files/xamivezamifo.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d25490998035d3d190d5123762c9dc2c/bupoxogaperedujetu.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a97599f8---88026623003.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/ce7782cdc4de5ae4f50e05beb0ca3165/35559658702.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e4bf5d0ba---26955551628.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160797233ab0fc---85857887849.pdf
    • http://autosoftware.company/autoresponders_images/files/pizekibivilamutumameb.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c505bc8a492---memotedevujuvuludobito.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a10017a2---24475315498.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871853d0213---40322128426.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d4e8c6b04---zurusatanamijexidu.pdf
    • http://dzbnf.com/upload/file///botitatak.pdf
    • https://maisonforville.be/documents/file/wefinodugefelumixugapune.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=olive+editing+software+download
    • 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_off0000e942.bin
9d09ddcd7f6b14f223c96112cfe61eda095549809c5be0adfae5734a953a13db
pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10704 bytes
font_01_sfnt_off000101d5.bin
41fb095e574c3f8659b61c64b123bc0e784d89b6738b4cfd7215359e8d7e9771
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 16300 bytes
font_02_sfnt_off00012bf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF7 16792 bytes