Malicious PDF — malware analysis report

Static analysis result for SHA-256 590b8aec521d1c44…

MALICIOUS

PDF

114.6 KB Created: 2021-09-01 18:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1edf37c8ddcdea1717ca634a53164af SHA-1: 9aec45a82187e8f6cdbd354a8493eebfca50b152 SHA-256: 590b8aec521d1c44507c3867053f4b491ad50c7e28bdc48526883d03f830772c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://infrive.ru/uplcv?utm_term=two+story+deck PDF link annotation
    • http://allaboutdowney.com/userimages/43086337251.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608177ca16645---sabebobedefezi.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/bajonulorarenovut.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9jr8sq6o76uaf536e2iceddbnf/bobetitipodevimuvolovib.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ludununibobukove.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/pijisifavomibubafonelil.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/42806800.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/46522624106.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/segasaburenaviz.pdfIn PDF document text
    • http://goldmustang.ru/files/files/wunabugagipogiw.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-28/20210728103434775364.pdfIn PDF document text
    • https://usis-consulting.us/uploads/files/dexavomuwutugep.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bceda22e0---61593125912.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/kopusalabazipiwufidot.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/tekokiwelesejoxirenozilu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/gkmv3n4ccp3917phlk4baasn2t/jexufidojuwegilubosofulex.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/l4fk8e8titlkl6uo9gldu9ppkj/kudevokonolabofikusad.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/92461024953.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/78130387874.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a38e403373---81038913238.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4363cdce06---jufezegos.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/37444490645.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b179d33857de0a36e28243e6ea0939e7/vemik.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/s3c8hbamaq5drf8g3ofcrgf3b4/zamazunesazej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E8 16728 bytes
SHA-256: cae6e200b1f30a3a6cbcf24812937b57d2a2f7fb05aa4c0b49a887cbcc340059
font_01_sfnt_off00018c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A48D 10212 bytes
SHA-256: 95f77ad48a03e3cefc44c3b79fc847238698369db55628efd41fcce890a6efc0

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