Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace167b0a0e6807d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-11 21:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffb25abf0e7e0440798938c36ded459a SHA-1: c5fa857732cfa98f784491f2b2fb2c3336d1dc52 SHA-256: ace167b0a0e6807d52ce6207c6e9e7e7b97b89ee9433f72eea010e04dbaa9801
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=best+free+skins+in+fortnite PDF link annotation
    • https://noelex22.org/userfiles/file/61764078816.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/764022b6f397629dd37baf00760cf9d9/14288605416.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/vojuji.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/57842338247.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7510f1c1b---gibevatalizajoba.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/xojiwukej.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/zunuganuzetetakovupo.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/bobitegomubetobobolugu.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/xifusuxafidofoxedubax.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/fenizazizesoraroneban.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/gemodejolowijo.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/23690003156.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mavegazolode.pdfIn PDF document text
    • https://labelmarket.pl/data/file/36780012903.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/vabijibegejadu.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/64368995228.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/76370997385.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/51104096458.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/94603620047.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/62462876297.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613141e62f763---66037888312.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae5823d2f---bifemawute.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/zoniduwogexex.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/81606700717.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_off0000b5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DD 15160 bytes
SHA-256: aa1084fae9046770dcb48810e5a7e4f3bc244ce4398fb3c41a8ced473e049ee3
font_01_sfnt_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 10144 bytes
SHA-256: f20d02e8b6c60d8b66a67c882dd14b71179775a5c416ee492a34ab78b9014293