Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f61ddf1834893de…

MALICIOUS

PDF

67.4 KB Created: 2021-05-21 14:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0237fa6e721036db1360d13a28062516 SHA-1: 0ea22895165b5d4b9436ff004b6e2d975ec2fae4 SHA-256: 5f61ddf1834893def9671596cc9156bb399c4ce8317d09e431040533da9a1a10
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body, while appearing benign, is likely a lure to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://orgue-chantepie.info/FCKeditor/upload/file/pebunubunukajuwiroto.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/likbd3dpu5e330dtnrru4b5t57/vupigizetolex.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a8bf2d4744b3e330377f4373a2ce30b5/fakisutukadu.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854e321f2b3---rilonasowutizebexe.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/43b898b36f61b20bd2290007988edf2b/65664177164.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab137996df---retozig.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4566c686---4451630157.pdf
    • http://zkojicin.cz/userfiles/file/jigaxidireji.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfa73ff7e---babasexulepi.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8c959ec8155738ddba0f2e9557f92eaa/faruwarapoteriwetore.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160828a4b226b2---waxiwu.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/uol7gr3sio1he9n6mec21fkcoc/zubirusoduwefokebobo.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/adaa41b673e01e26b3f4d861a8572071/vizuramejanopufare.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a16c8c7264ea2b6766062550a88f1380/32943759673.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df4b4ffed146e50ff6d3302e44c24319/vedusiwoviparariwedolo.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2d79b66a---97947810398.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/q1u5f1gtfs2n8tlglrcvlr38i5/lumuxuvi.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/gp4dan7i2odhcrh5pd4bfafpp5/77501832101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+clean+a+kiinde+bottle+warmer
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccfe.bin
fdb6f7b36aa4ecfb6c34f76d8d355e17954850c096563a3da307bf641c078623
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 5164 bytes
font_01_sfnt_off0000de85.bin
05bafc1fed713492742269969a1cdb4c84bd9c33ff1f718f83d68e3162962cdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 9984 bytes