Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd222f7d8ae8275…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 11:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 475517017358776cb89f399e9040f522 SHA-1: fb4971effc0b05ee2a3d2e1b7729a9a30ea58e6e SHA-256: 7dd222f7d8ae8275183a3b7f9b15be9a2014389207b53455c3e372dac7755a05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://nomylo.ru/uplcv?utm_term=tree+or+three+pdf+gratis PDF link annotation
    • https://aronabritcan.com/userfiles/file/bulolifer.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/jonakosedewokegi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/07fcf45f8e11429659e86345b283fc96/64944655885.pdfIn PDF document text
    • http://yilip.net/userData/board/file/29385548198.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/28517647652.pdfIn PDF document text
    • https://clubon.top/uploads/files/fuginasizupurem.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/vesubipovesakumurupatif.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/padagoxijikumube.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/m0ika709uhnojnj9tmb54q5rm4/kevekutitagegu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/90q7auvlvhuae2ijls650ad509/69196205623.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/77647769219.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8f557c6b0b1187f951463b9d4229d5c3/difeze.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/74472271188.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/vc7obnk6dr2h2pv248ha1m6d4n/15650740681.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/lezumu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/riritorojiwotot.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161237b631a37a---lesuzosibuki.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/11138804998.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607536827c15c---kilopafaxetemiz.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/62254366506.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/34221343118.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7c2ce512177ccddecee281e60ef77990/85858272081.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fea1cbd97---domawe.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/df715e3ca9024f2f39a314b3b197bc6e/gupir.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/5608432623.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a7f325dede8d289074992192c345739c/48114488434.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 10588 bytes
SHA-256: 0e4a046b37c143f6cb82f0ef843afcc2a2d8393b0c8f6f3551f77b67f96e0cb1
font_02_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 16640 bytes
SHA-256: e4e4195f638f0106c25b9bf06733ff932cc87f0fce9b6866c50545ea646235ac