Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea9bce62295edf4…

MALICIOUS

PDF

80.7 KB Created: 2021-07-04 20:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 77451bb16411db5bc60819092fb5487c SHA-1: 98f5ede239a38b749088172ab222acdab04094c7 SHA-256: 6ea9bce62295edf447e22212facade6be35b2a6ae8008225693380bf80b3749e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://queure.ru/uplcv?utm_term=a+polygon+with+seven+sides+is+called PDF link annotation
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2c9114eb6a02b0c65c7073ede5956057/5524635488.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/7vk8r7t15pr6ud7isbquv8re7l/gupabi.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819fd749dae---vidanufafonaxisuviwijim.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a801936bd---paxiluvidojimid.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff316a058---xobaze.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/57769236206.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/poleliwugilorozaw.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160768626d6af5---saxusiwukak.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/tn8hsc038hve4rd3n1e0e31t2s/vezaludumurumavepoko.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a070c27438e---diledigaluzeref.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac40d1fb7---691963061.pdfIn PDF document text
    • https://5uempat.com/contents//files/23983564109.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/gekoletoti.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/nuxukubolelujojokegoni.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/zaxevatef.pdfIn PDF document text
    • https://tmtteks.com/files/31466674095.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/kusej.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/gisixatezenapinoguzekune.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085479c3f85b---datagexikexufogimonukef.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/shjucii27238r1gran2rmq390h/77833756112.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/nutidodemofetafudixodat.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/28601788189.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/n32j5bamebcldcskgp6rn7ovio/20811330859.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/65787589444.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/15024782731.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC215 16648 bytes
SHA-256: 908404b9c6e274e99d7a3c8684c201e4a62e84e05ccf50583db67d3ae2032aaa
font_01_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 10940 bytes
SHA-256: a894f87e6b1dcaed8e0d7295b9ec0ced8365da1e1ed55221296e0ab8309d3f3c
font_02_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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