Malicious PDF — malware analysis report

Static analysis result for SHA-256 525d167165dcae8e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 01:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dce75e22cfe26025575c1a7f13a634bf SHA-1: 5ddecc38c79917d265e91d15d0d3797e18eb5c46 SHA-256: 525d167165dcae8ef5a6809dbfeb9b6418fa9af3d16325129a4a02ef8d6b9482
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest a phishing or scamming attempt, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=cooking+fever+happymod PDF link annotation
    • http://faceconnects.com/ci/userfiles/files/10122026519.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/13002301006.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/18983405509.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8027b59d---10875959351.pdfIn PDF document text
    • http://egitara.com/upfiles/files/25745184367.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/daxelexerudijivawokemopi.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/vimevapegakib.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/32368377955.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/xovozasofopame.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4bc994d6---61849298662.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/pumoketobewuzom.pdfIn PDF document text
    • https://profm.hu/files/file/tegagowigu.pdfIn PDF document text
    • https://tekartltd.com/upload/files/17676197141.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/06b304c6ff861c61df5305ab5c879757/dopexe.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dc4deec70---17245071456.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/movoruwekubo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161439d50a5a48---gutogopudukas.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/rivanabe.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/joziduwubirafedadup.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e9687dfdf4523156def9a6c879298dd7/fanazem.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd808ca285---12670265607.pdfIn PDF document text
    • 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_off0000c26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26A 17140 bytes
SHA-256: de488e3bdebbc531ce7d40c07847ab93ec5a7f7e91ad1dd8545cfc5170da583c
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10936 bytes
SHA-256: 4a35fea098ef83836f64783b98d2ed04153f44da09b873e57b706dfd3e821811