Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece33685ba03c3e6…

MALICIOUS

PDF

92.4 KB Created: 2021-07-13 21:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 416f4b7fa212725284d3fc3ba5d59e7b SHA-1: 17559803ea6f1ad06b28d05ed27987e66a63ab48 SHA-256: ece33685ba03c3e6a46d25c5de3cb6e3c374aaab30cf8628e50fd15ea292453c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://placc.info/up_image/89820777799.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96180a951---29202976413.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/59332198628.pdfIn PDF document text
    • http://wphs67.com/clients/9/95/95f8299e8098c1f2c85aab0f7ead5e97/File/45324296585.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/pbqhrgvbdakephsbroj2iapmpn/gitomawogixopegozasukako.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/zamip.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/vopokutiwolodeju.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16071365e5743c---78554901098.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1606ee53873fdfc576bce1f3e1e92be4/megewisuzeke.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c73fc167b3d---4256128822.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d551740171b2d08ce1c667c723257669/93699549841.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/juzemixovaxoxufimusuto.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb8376b0c---80549270209.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/7056386008cc262688b1a7c8a7f5d500/rivuwavimowofifefoxaruwar.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/87e8af3beca5f4bb339f2539461a9e10/12797737231.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/bfcp69416pbs0f276kepgcfoec/27012407702.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vanob.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a8d64a81c2c---xojogirezolu.pdfIn PDF document text
    • https://schmitz.cz/res/file/94976461095.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/cc922cdde71d556ee3e5841c7008a698/mesikijalemulavogorerop.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/i1o1bu4qhthq9ue8gm6nj4f7rt/tabapozigiwowarove.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a9497b6f36e3e49845c278b245427a61/38488949266.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/sewewepigozisepulonexixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=stocking+fillers+6+year+old+boyPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b173042a38cd080508b09ec3e3c3797a/bufitenevuledesoja.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_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 18364 bytes
SHA-256: 9a1ca458ad983c99b865d2df9d4ac0d85bedde780366239591cb1acabca35b86
font_01_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 11240 bytes
SHA-256: 8f129e63e6429bad94344b519f8e7002528a5cf4667298aebd051246a1562ab1
font_02_sfnt_off00014a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1