Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5428c93b8fecb44…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 10:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13b1154fdbf0a52147e1c1865cfd8716 SHA-1: 0335e70a51fbb78fe21a51cc6343a3dd6acd63da SHA-256: b5428c93b8fecb444d2d7a125032134393c3c40eb8d4ade761fece58c639bccc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external URIs and link farm patterns, directing users to compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=punctuation+practice+worksheets+for+grade+5 PDF link annotation
    • http://okmarin.ru/userfiles/file/kivatuf.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/78ebd507307ef6c95558251f8564feea/vumotanakawu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/36687d8748f54b0f712a9f351bd3f469/desid.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e201e5dd52---76440448721.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/37559128561.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/1680066948.pdfIn PDF document text
    • http://myesen.life/userfiles/file/simedutebojebugufenopu.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/7586153264.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0b631a84---kazipifa.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba979d5ba7---70699195682.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/gutipomogan.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/mewuvuzesifewugexalizid.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c46cecfca---24194896290.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/24806512011.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/10119ac367dfee243e7f61c92ef52718/zajeginotojidepija.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/voxodafevatif.pdfIn PDF document text
    • https://jotelek.hu/files/file/votuta.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc5453689---94895170470.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2adea21a71b1582559e2083d401c9aa6/40274141565.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5980962df---31603816789.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a8ea57bf7---85864032856.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/fukuramixowud.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_off0000bb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0C 11264 bytes
SHA-256: 15fe7e5487735fb4b384020315e528baabb8685d44122e684ed1bd1630ac1fb8
font_01_sfnt_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 16360 bytes
SHA-256: dd89893d15ca15198748f101595db264387383d3df0e89154d3c4647f00e272a
font_02_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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