Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64d5868e4960154…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 09:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03d4c521e3a331768beb4279471dee2f SHA-1: b1dcff51ca0082dd6d8f33a8d8126ca885bf9a49 SHA-256: b64d5868e49601547232491e2f5710284d5b84f08fdbba5f0ccfcdbc4490c07c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=free+unused+xbox+gift+card+codes PDF link annotation
    • http://marupi.de/UserFiles/File/3823765049.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4737ef158c04cd93a0d622d83a7a6c51/jawebemunozikapuz.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/40748063064.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa720280ca---jukufaponiwo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161317b324ca5a---96772656757.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/24253873566.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/1265261617.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/dipakebowerodonijojafodiv.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/80845407844.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///63840414772.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/34261641392.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e362e9e62---95785523232.pdfIn PDF document text
    • http://esteel.my/userfiles/file/27657361484.pdfIn PDF document text
    • http://tochuchoinghi.org/files/xatufamaj.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/1016819989.pdfIn PDF document text
    • http://3q1p.com/upload/file/210920041155997752lrzhgidnu6dz.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/motedowepekasetuwapaju.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/zifejigawijami.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/37815705864.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b089f92805---jimumivepamujuvifupedax.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/jadixojizolopolewutugutuf.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/43337125282.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/92093853221.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/jawene.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_off0000d129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 10924 bytes
SHA-256: 8a64bdd218ee03e80a6ac1e45f97d8fd316264db0ab456aa67a28706495b56ef
font_02_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 17516 bytes
SHA-256: 33796f38f5ecf98cbd74c48b9b923fd8c757a4e261831eb253e7330b6a65ae92