Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85210d65aad2341…

MALICIOUS

PDF

105.4 KB Created: 2021-09-03 03:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a8b7e044b4e6c108a67116b99d1087b SHA-1: c1ec7ce7f65887ebb71b3ce50faed58acbf04857 SHA-256: d85210d65aad23417bc2380ea1af144d91e772eeeef7b743b29c4ac954f05d82
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=menschen+a1+pdf+free PDF link annotation
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/88ebf28550b6e86cf394b99034ca16af/4107344833.pdfIn PDF document text
    • http://vodnik48.ru/content/file/luladonupaxalowoguledavo.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/62834552065.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/serezotijapom.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cac97b25506---mazujoj.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950da5e0fa5---wosevegirolil.pdfIn PDF document text
    • https://tangentemag.com/img/file/8367009050.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/at3ujg2n4jku0caa8175afqutu/gaxuropul.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/jusoxu.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/fexobipamabudebut.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/gabujupugipedaxewo.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/vaxipimoxazipoxiber.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6dc867f7e6e2c4aa7207a4f6388d13f3/17022002443.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/gotezanejogotita.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/83598361035.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/tq751ndkadbphagfvo4jg61t5t/79880362167.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/bamokimir.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/mirafute.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91466ed57d---birejofisanalovujorubizi.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/woxemazi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c425a1f793---bozeniwilekuna.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_off000138e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000150f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F9 18660 bytes
SHA-256: aad232127063b600553bf749b3364d7fc58b77598bfe060167f2ff178c4dbbac
font_02_sfnt_off000180f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180F6 10408 bytes
SHA-256: 17271dd698d016e793b29de0b48165a9f8938bd46dc43cb44f4072a23d012740

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