Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ff28a17b2156d4…

MALICIOUS

PDF

81.0 KB Created: 2021-08-10 23:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 088f4090b0e663064fd6913ce6556848 SHA-1: a5c4e636a199bcfbd237f78240fdad983ba05382 SHA-256: d9ff28a17b2156d44cef03a842bc6be058b943db46f583f56aae264cd01a3711
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crmrealty360degree.in/userfiles/file/40360288609.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/somufodadesu.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-1/20210601212931269818.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00bf236391---80483458957.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/91042eb36dc4a98b793540bd2c68caf2/gixizitita.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/27592130437.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/velamafuxexoruj.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/80d749c0055026f2273520e09a7198d5/97358338546.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xasukaxiko.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/mutubilubifagup.pdfIn PDF document text
    • https://telenovella-bg.com/files/wajojaniviturokobonetugej.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210525180006481.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/61b6595ab0abc3013a41e9b15dbad4ce/xesojisefozaretifulasumus.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7f3e4egfld6m6u1hhm1trbhrl8/jekaxeredafidilagav.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/wotivopogujuzemuwejedi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b337b43d97c08ab2bf69bda310298d28/81869122599.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8d54928a3---29180513565.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///66326819779.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/potunexidifufape.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/65218617967.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/28292066579.pdfIn PDF document text
    • https://moolans.com/uploads/files/fogukisixipalavovukutofeb.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad96a31a5---wesosijanu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d973436e11---14034472390.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/96500054909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=o+kanha+ab+to+murli+ki+madhur+mp3+song+ringtonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 11368 bytes
SHA-256: 459e7af592b4e3ce726a9d5396e5f200c17f8e77a10415df4ed4b7fdffbfebc1
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 16940 bytes
SHA-256: beae368f7ee08b19e2ac5ed61285fd5b924e8bd5c767822b2e94898003f49290
font_02_sfnt_off00011d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1