Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f64fb91c4a68dda…

MALICIOUS

PDF

100.5 KB Created: 2021-07-09 10:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab95e197f40ad694374644c4254fce37 SHA-1: 53651786681a67a36818997dec8583d8240c520c SHA-256: 2f64fb91c4a68dda985249c36e292cdb353ebde2e45a80786ec563bd329f254d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://garglob.ru/uplcv?utm_term=chapter+one+lord+of+the+flies+summary
    • http://lindseyderence.com/userfiles/files/gifibizizogatete.pdf
    • http://a-kamen.com/userfiles/file/16411928907.pdf
    • http://sun-tes.ru/files/file/musuduvuredinavegek.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f3441c711005613078c7fbfd518a6fb7/15850839158.pdf
    • http://hykylalumni.org/userfiles/30020884759.pdf
    • http://busankid.com/webfiles/board/file///31682536982.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077af83e3ef2---zavitegoliperabewesoj.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f4f18a58---57632934622.pdf
    • http://ajk-opakowania.eu/upload/fck/file/vanujafukogi.pdf
    • http://svaz-podnikani.cz/files/file/95547744762.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/06463e03620e6b77c66df19ccd984870/bonejijigoliz.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/aa10a3e74139d4d4e50f84b8b1905e22/97060486444.pdf
    • http://duancanhotot.com/upload/files/59722178740.pdf
    • http://edu-family72.ru/content/images/uploads/file/fileguwekupisilojoporosuj.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0f1fd89047c29fa5ab798ee86e505b76/nelebuxamaxofofokema.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cmlebkqosc47njos35hlafedqk/lererubobadijufefurazeva.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ev4ml23dkrcepgbkn2stjr2dn4/sikugivigarumufe.pdf
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/werojasozelanofox.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072781610cda---24007253120.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rlfcfepcv5b7aqakklst729j05/72844933220.pdf
    • http://domholidays.com/userfiles/file/93412817408.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a63e6ed1098---12563924662.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a234714833e---52780602740.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012627.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 16792 bytes
font_01_sfnt_off00013e39.bin
6bc36322c734f16a48e8b1da14ee1475a8c6fcd108b2ffd74b98bda72847f09f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E39 17404 bytes
font_02_sfnt_off00016b6d.bin
1813d162ca726b36a247157c08e4caafcc80f268eec6bf067626d1390f62745d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B6D 11008 bytes