Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acec8c733d699ff…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 00:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89d2edd9834d1b214a7bd32fb6ce06b6 SHA-1: aeed6a392a8280c489532f9c47c647aeb706de4c SHA-256: 1acec8c733d699ff6a4277d3dbd16fc26e85a7cf5d0cbae40c4c33b548164fee
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the link farm structure is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://orthodoxvaidikasanghom.org/userfiles/file/wefajaxozopifibiguj.pdf In PDF document text
    • https://ptkas.com/kingkong/userfiles/files/68936776901.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/rolujojagan.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/65959981369.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e580215e5a6fcd73bc0b2c1cdc507f16/89060874911.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/jinifun.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/71072c3e09f49196637eb534e11689a5/18613481439.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/vawajojimonesisov.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/36585694800.pdfIn PDF document text
    • http://canoeing.by/pics/files/votumoxomobawogeleximiv.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/pefuwubavarixuki.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137854715b30---16145642881.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea05d53e2---wibilade.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/putezujukubegemof.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109112036094302.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/nareluverununevakexateb.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/19665235579.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/kowozoluvafotijesidi.pdfIn PDF document text
    • http://www.centralperdana.com/file/6566106034.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/pejefabazoxodonatadawuz.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161450989ecf94---venurigogeriloja.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/95868757496.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/4572732317.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/zefizilukenasaxudojavuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=step+by+step+phonegap+tutorialPDF 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_off0000b9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C9 10960 bytes
SHA-256: 228765cbbbea4be2edef6e8afd632ba3c8044855a070daa282cf60493842b656
font_01_sfnt_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 16436 bytes
SHA-256: 7fc5a340adf96655b136716929046e6a1d9532dd5f5358934378f8ba3d34039e
font_02_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1