Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4da745d9a2b01a7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 17:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 3b099e6ba405bdaaa27a996ea60e1a4e SHA-1: 94468cf417d17bfa5c9a2e35d54c43bdc007cd5d SHA-256: e4da745d9a2b01a7b97f6405af88614737cb6ad0f9c5dd5e441fe259ee2bf2ea
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://777mto.com/contents//files/6837344576.pdf In PDF document text
    • http://teleinwestor.com/userfiles/file/5423797702.pdfIn PDF document text
    • http://tajilin.com/upload/files/xifapikefagubowated.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/75120078255.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8256a25d---verikava.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/39164956023.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161217ce3a7ec6---69393449491.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/sexeweluwigiw.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161292e72dbf90---68268481433.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/72506443306.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/tejoxunolelugudufatatoliw.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c55074246ca---vijopifitujimiv.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/48192254706.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/35449547702.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/1450480920.pdfIn PDF document text
    • http://kmsenior.org/file/files/vevobepeparixujem.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c621b821f12---89504560679.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f0aa49dda4cb91e69c2e606cc8859398/62425580128.pdfIn PDF document text
    • http://nprofit.hk/userfiles/82954276651.pdfIn PDF document text
    • http://abwrva.com/uploads/files/mimevivutuwokudotezeso.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/67758990357.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb22d3a514---22447067188.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/6163093461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=golpe+de+calor+pdf+pediatriaPDF 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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 10380 bytes
SHA-256: c28561603e96e4fbdd962594d491ac374cc1c4347c3a77b0b931e7604b145f33
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 17316 bytes
SHA-256: a15614cedb551766d620f813dcb1748b413c4f84b647b0a77e25c161a4329315
font_02_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1