Malicious PDF — malware analysis report

Static analysis result for SHA-256 f822b5ae16f09609…

MALICIOUS

PDF

99.6 KB Created: 2021-08-10 03:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 849550df2cd14acffd0a46400514954f SHA-1: 7782f6d5ad5d0ccf18a2638f5f532aba03ab5942 SHA-256: f822b5ae16f09609fda21483e0569d34a1048a98a0528b0d56f75363f602bff1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://albertopizzetti.it/userfiles/files/25484874836.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f1b074aafc10890cc7f47befdc8008d5/dojuxobofotusoriradavafo.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/noginifegatoxow.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/powijefakisajew.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/54774394521.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/mcd4jk9d6gfoa06csrv0upu1se/fibulonomuwofa.pdfIn PDF document text
    • http://envigest.cz/upload/file/kamezala.pdfIn PDF document text
    • https://tadimtursu.com/image/files/pavuxugesoxavizutu.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/niwenetofuguwez.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2b926be3a---29338063315.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/37630885956.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac775f21980---gebobuxekadejulobid.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c47cc463c3311822ff7dc77a35fed0b/dinovisatifitujibikudok.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/22147320827.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/11791779135.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b2f70c3afaefea10dfee8b162b0c4a2f/41216892479.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/zejukumidi.pdfIn PDF document text
    • http://pk.mo/userfiles/file/podiguxetoromonomi.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/kululob.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/onk7g8uejoupp6519sd5aeqem1/bedajevenemomefelidod.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/85498d8d1113c698b1603f4c2e7ca0ef/subepivexutiletom.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/mujegi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/uoptui3ovco9ft9c93ssnkjbsa/75670453106.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/45362739760.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102c78b66698---juginuvafoxigogowiguge.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/37487742854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sample+letter+of+recommendation+for+teacher+of+the+year+from+parentPDF 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_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 10908 bytes
SHA-256: 2506ff6ea2e294b2b14b780afb2e77a6fb8d78215601c407e8066d3d1dd4405e
font_01_sfnt_off000139ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EF 17208 bytes
SHA-256: 74f7c981420797d66c4155f0f82c11423020482e424f1389375ce92583f4751e
font_02_sfnt_off00016673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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