Malicious PDF — malware analysis report

Static analysis result for SHA-256 f785c5a2856fae4c…

MALICIOUS

PDF

71.2 KB Created: 2021-10-04 07:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 27ffa7490461625dcf8a1648355efc86 SHA-1: 0f50b87f4fb4611a628ce5f13f45747c972f6f3e SHA-256: f785c5a2856fae4cb2eedd3414dc35b74e48199e625d9172ebea7f7edd58a6c5
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pes.edu.mn/ckfinder/userfiles/files/lasape.pdf In PDF document text
    • http://kompletucetnictvi.cz/files/file/86484150099.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/67222124449.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/zodonawidit.pdfIn PDF document text
    • https://cartolmania.it/file/maximazanawalevalum.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/sedeg.pdfIn PDF document text
    • http://candientuvibra.com/images/file/pusabenotowoxekejefexuros.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/kuwalerozijowik.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/13838253790.pdfIn PDF document text
    • http://vasa-project.org/fckupload/file/61785192741.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/12892895685.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/17030405722.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///sukuwewakadude.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/81425649646.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614883f33875e---sasuramumojirijosovuxane.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc2fdf5de---taligejixel.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/tifotujamisetedarizewafi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3ef2ec34c46732262bca9a8d6b5451f7/fupadapigorewela.pdfIn PDF document text
    • https://mkontroll.hu/File/10011235161.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/ginadolasitewiw.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0hau4qn5jfbekj1ulqsmj1mk37/70517868457.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/kimokijapatatinogi.pdfIn PDF document text
    • https://kimcert.net/E/file/mebem.pdfIn PDF document text
    • http://popeyebio.com/upload/files/mopoko.pdfIn PDF document text
    • http://air-con.ru/upload/files/tabadamozex.pdfIn PDF document text
    • https://2acontractor.it/images/file/44034293024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=where+can+i+watch+zombielandPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB649 15612 bytes
SHA-256: 4475ca341dc6be0f7a4379167eb3d3f8e0659aae41d7f42a7001b85886a0d165
font_01_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 10748 bytes
SHA-256: 38bf6864185adb4730eedda671b5b9ba4777062101b5a9883c93651a84065605

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