Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83639d0db80743f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 11:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c8ed094bf89ebd7bf24d69aa937262f SHA-1: 32a16a3be2e0884e0e0f3799816996c0298a138e SHA-256: b83639d0db80743f4eb8453c814172896f3b1944bdaa121f3b12b1d2fdc22c69
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links point towards a tactic of overwhelming the user with choices, potentially to mask a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=ssc+je+2019+paper+pdf PDF link annotation
    • https://medius.sk/userfiles/file/banew.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16091bbf685207---bavirexigamesepava.pdfIn PDF document text
    • http://bjjiffy.com/upload/82581574442.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/95266206510.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/paraguxelijoxuwepekilu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faddc46329e---17139252291.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/veduvogerilejigosafazo.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/86140891461.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/sozedasen.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/xakaboposexawaraguvuf.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/kutenodexurilijipuz.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/8444371921.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd0e6dda3---771403862.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ea33814f35238d35654d54a41fd3a31f/53436626790.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/b11jgtgigaeg73sl6ak94spg5f/50148702983.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/21660356092.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/rijesakofilovopimipewimox.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b188d25f857ace78f2ea824dd7e70843/podalimokupidafapepuxuped.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/r3hdkfrdrb1c439elid0e1g5fh/baduzaz.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47798762063.pdfIn PDF document text
    • https://fishuntpesca.it/file/6007529390.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/juderepufime.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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 10820 bytes
SHA-256: a4c98f5fd951bcd9a6c1279b380207c2346b9c46fd2cb6e72da02e91a3b10aec
font_01_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 18108 bytes
SHA-256: 33638080953dea444ee2c55db4b02aa87d8f3a3b99f2d68f206cf64e553b9f15

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