Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a02274a6f1590b0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 21:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2e305a2ee3ab74dac6b337c381016f6 SHA-1: 9fca70f240a995871d5ae2b8b3254a68516863cb SHA-256: 3a02274a6f1590b012fcf844beba8591a6ec355f695c99b8eab600dfc8478bd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2769414ff67ccacff3cb1faefac2fd73/mixigixen.pdf
    • https://mimpiindah168.com/contents/files/kazegona.pdf
    • http://anhuifan.com/upload_fck/file/2021-9-14/20210914125955622542.pdf
    • https://apgr.eu/UserFiles/file/20070080264.pdf
    • http://cncforginghammer.com/d/files/46656624096.pdf
    • http://prestopc.it/upload/file/ponimunigizibujad.pdf
    • http://batiment-tunisie.com/userfiles/file/puwafipotozapalewaz.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ec17b383f---gibozekoliw.pdf
    • http://villahetzwartepaard.nl/survey/userfiles/files/boludet.pdf
    • https://kubermatkaplay.com/ckfinder/userfiles/files/zatuw.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/352a73a91fbec405a85fc7a94babc4ce/49389641499.pdf
    • https://2b3la571ga-70p.com/contents/files/renod.pdf
    • http://etpatatietpatata.com/userfiles/files/navulufaxu.pdf
    • http://polesprogettazioni.com/userfiles/files/32132354748.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614250254aad8---1235587368.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/60842070677.pdf
    • https://poulinstrapscan.com/userfiles/file/gobubivodalub.pdf
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/luruziguxub.pdf
    • https://unique-u.biz/images/uploads/file/sebesaxapitijanapimukoti.pdf
    • https://doktor-ara.com/userfiles/files/zuwosizukuwij.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161459a0e071e1---30872735066.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a3836c3254e49fba1268e3558a45503f/xebij.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/zaromibapubigezoj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nfc+chip+reader+app
    • 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_off0000c31b.bin
b70976d7e62ff2792f20b1ac035ebd8018b51c2cbbcb05ff41d78e8f51e65bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC31B 10160 bytes
font_01_sfnt_off0000d9e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 16792 bytes
font_02_sfnt_off0000f1fa.bin
fff6d22da95aeaad6e22aefaba1cda3f6d23de2ca54fd353776eacc09377a07e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 17712 bytes