Malicious PDF — malware analysis report

Static analysis result for SHA-256 627846fa306d4c3b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 14:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e305643a5e26a5dc32d0ee570f2aa03 SHA-1: 50d9a0baed806413c4fa7d89706864520df80f2b SHA-256: 627846fa306d4c3b26ea8c871462fd373cec0751328369959fa8949a95da55bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute malicious files. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely using a lure related to device manuals or updates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de76a6c35---58096033825.pdf In PDF document text
    • http://costruzionibulagna.it/userfiles/files/waruxemobuxitilabivowip.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/87360162245.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/4394483883.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/dejifabef.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/73776997067.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/54321410149.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394bebc6c14---61246848756.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/1095085235.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/37869284336.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/96890931142.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/18625183872.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/dizafetulubapanobesoredig.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/74532051806.pdfIn PDF document text
    • http://parentini.it/userfiles/files/katozubokodawutuj.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/27bd8140c3252b44108a357f4bd603a5/witenajamupazoruminoti.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/80803804413.pdfIn PDF document text
    • http://msiutilities.biz/documents/rizumurafifemojenevaf.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/df97fdecf462c5f5605f009b35826aab/39727042304.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/xopapabusukefani.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/ribazitovimugesugut.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/84408933229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=redmi+note+9+pro+manual+updatePDF 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_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 22836 bytes
SHA-256: 1bc0382bad896a234062858ae19ff4ee743691d3e65f5c7eed88c6b26d346b60
font_02_sfnt_off00012f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 10700 bytes
SHA-256: 9f4aa6a100f59cc1c5067990c9353d75fa82e1e209fdecbd2ca1e497d47d6b79

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