Malicious PDF — malware analysis report

Static analysis result for SHA-256 40634f57c745f871…

MALICIOUS

PDF

101.7 KB Created: 2021-09-16 08:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b4c009078769995ec8644f52f7d86ef SHA-1: a6942736888a1dd68dad97525aeb9fee1a8901df SHA-256: 40634f57c745f871deea046bcc95a2df3076dc8545cbed0f452e6449c3287e9b
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=dead+ahead+apk PDF link annotation
    • http://lsphc.com/userfiles/file///tapiliriduxiwikigo.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/somatus.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/972f95a30f44984cea48f967a2b28558/59429943759.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0317492001630826584.pdfIn PDF document text
    • http://www.moyekolodin.com/files/47383252299.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/luzinopuxesibomifu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/6817605488.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fff710ca5---ronuwosavixezekowazaxova.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/74315025974.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/nebafinup.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/82489947083.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/65474225859.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/wijotexefo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/02fe96ecb7fc2af5052adeb70e3b27ec/95398091483.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/30557307545.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/guwosu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7d328f8f---zodobe.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/753868c9f8fcca363e7752871f8c17cb/73722772415.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/65820937713.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/16776922558.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/57037618449.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132283fe7f8a---reravuzunipexura.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_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 9852 bytes
SHA-256: 7de39538ff1ab21e29e338e3158d6ed68a17f55318763e164d97ea1df9855e5a
font_01_sfnt_off0001397f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397F 21256 bytes
SHA-256: 6f36222ec5dcc12a66bd05a40d5d0c629832c4ade7f39bb5211592de07f61b80
font_02_sfnt_off0001714d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1714D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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