Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2afaf55aae80dae…

MALICIOUS

PDF

88.2 KB Created: 2021-09-09 15:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cebe3cc34265e976530ea1ca8a9068b SHA-1: d034f66111039c081d20a43625d462177c004376 SHA-256: d2afaf55aae80dae37405334590104625dd7e22aae178f2968d5d9b8426f77c3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics confirms the document's structure is designed to redirect users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://catwalkdogcome.com/editor_upload_image/file/51694057475.pdf In PDF document text
    • https://hiperaktivite.info/userfiles/files/vafimefikowix.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/jevasafig.pdfIn PDF document text
    • http://tajilin.com/upload/files/rezakudojivumitalezuv.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/vebumama.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/84786751704.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/24041580363.pdfIn PDF document text
    • http://debten.net/UserFiles/File/84833683451.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uv0jteaqofetp0em7jmlr9k4t6/72871307441.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/dizaw.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/90349954361.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/64093732690.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ca4f08f1---53996924715.pdfIn PDF document text
    • http://chenruichem.com/upload/files/45210725854.pdfIn PDF document text
    • http://newshop.jp/archive/file/vovotopuro.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/46909724761.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gosupitiriwiwuta.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-06-23-38-48-95.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/lologutabubupenow.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/86630461434.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210901174513.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/kifalukazegotad.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/xoposamakiketib.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a6b0a79c708f7630d001360d3d996177/zesakaxememogiworesul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=why+do+my+apps+keep+closing+on+my+android+phonePDF 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_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 11060 bytes
SHA-256: 859ba654d8f78f52d5bb6ed01bdb702086c22022054e9b7727f7069093fa9f42
font_01_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 17844 bytes
SHA-256: a4fcac43dea6269dd9d7f6a53ff01c025a31720b73948b9d1eb2c0b62fc78ea6

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