Malicious PDF — malware analysis report

Static analysis result for SHA-256 6606594518a72949…

MALICIOUS

PDF

89.5 KB Created: 2021-07-18 08:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff172372d0568cf7358292568878663c SHA-1: 3ff8bc129b7ad67d36117159c10d049121ae26ff SHA-256: 6606594518a729492f5687837b1b00c32dea6f907c00da89b327cabc59f02011
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, indicating a likely phishing or malware distribution scheme. The PDF's structure and embedded links suggest it's part of a link farm designed to redirect users to malicious content.

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 https://prastosten.se/anvandarbilder/95/files/bezipimitemakopofofudipes.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d632ab272---jalutotegisebisi.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/9b6fd1f2dec38947cf0890ba7df3b4d1/rexunexirada.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/dad063839ffe552b96aabd1a96a8dd19/viwolilanulejeburerenixeb.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/fatujazefar.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/novalimus.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/50689878794.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/rowidosixowolukag.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c52fd833d37---jitimaseluvixo.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/fonupaler.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b9266053---27485021704.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d7fa58a2---26024101914.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/26109776845.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/sipujojuriwujunogidozo.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/fenefomolodufudivofu.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/37621561207.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/wisux.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/50637948586.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/29617287907.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f465878420---zatupefisalofibulaz.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb3e619ab---daragesejaj.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cc61c2ad23c43d34515829893a6bae6a/kuwese.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/zugojuzoporowimuxoxu.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/fupez.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/98869291708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sku+full+form+in+retailPDF 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_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 17804 bytes
SHA-256: 1d37b422ce5b771b89a38a88a7b97ce2d99cab98005d583c3c71e06dccca6611
font_01_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14106 10472 bytes
SHA-256: a8ddffc255c46763276f2dd2f5e095bc86d1c305b903448890606cc6a022f720