Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b5fd0aa51acbdb…

MALICIOUS

PDF

88.9 KB Created: 2021-07-16 04:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 16fd04d3c7261d1f4b73d32eda252c6a SHA-1: fd9223495d349e07ccc810b3fc139f2c35c8e090 SHA-256: b2b5fd0aa51acbdb081ae40e04a8dc730bf43694a7d3f60ea6c4976049852e87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ad8c4d2b1458502eb692375b29224667/fenabutapabogelosuluvobow.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaaa353b1---59306548921.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210515065803_681816804.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/dmtm8gsqgni4h0qkmipskkrns6/fabozojasegu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/028db6850dfaed6c77cfdfbf22b72970/69904839705.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/67ec5l48ii54dgcua25p5ungb7/widutin.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/eust3tihotsj946aou14taabi4/mugelawaxalusadu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/wadenopodonufopetevo.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/29387474836.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/67e397af4e39e95c259ec045e8d6d863/kikuwavaruzuvixovufujede.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/putenumikadidiful.pdfIn PDF document text
    • http://oodow.cn/upload/file/21070200293572919954wsmarm97t3.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/76884477216.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/jivenexunemowerukotobetak.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/webunubagid.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/338af6782f1b0709ff2162f87d5b3d9a/557774395.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f4201cb0ffa48a8504b0f28fcf883940/nujuguzakumonosule.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/fagisoxeza.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c2904c6df5ca7ecc454f51033f8555b6/sariwomaromug.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/zudenapovugewuxakifega.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/sibizipanuvimimuwuda.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160982e09ae94e---rakewojuwozari.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc21bc770b---lufeburesepijefa.pdfIn PDF document text
    • http://elitvorota.ru/f/file/12837467585.pdfIn PDF document text
    • http://hibertek.com/image/files/20210629_083135.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/u2ni7f6k6cqbmvu2ak6sd5fas9/kubowu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e60505dddbe---759597008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+fast+pdf+viewerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_02_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 10580 bytes
SHA-256: f245eac1d1002d400fe139ce5d00d6ef7da3a172b4106c5610e0bc8a7c4bf73a
font_03_sfnt_off00012693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12693 17764 bytes
SHA-256: 2a5bd99fd67ff195f35213f44801261310774fec45647009c897d299e53d5cfe