Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d36f71b0e25c956…

MALICIOUS

PDF

82.5 KB Created: 2021-07-06 15:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 244a4db4af08d301566b3176424be8a9 SHA-1: f8e167083cd1f7aeae6cb6d0afd71f6067467946 SHA-256: 5d36f71b0e25c956b833ebbeb27a46bb0c9a513c08952e83a6c330d256e7e8f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as redirects to phishing or malware distribution sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dousbvugk8kv0ca32jc294j7f2/80393299773.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160786618f2a9c---figabenagizajotewoti.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/935a83ec1ee60ea39d6668ef3a098d6e/balijulukejotusonosu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8b0d5cf78bda4446f3104bd43136703/pivesegixizikej.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9f36c679efec8a90f97c69abee52e312/80317233737.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/vasuva.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/omrn0ln872c5n2625gh419qun2/geropenexa.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/foboruxirojok.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5cc769660---35431018549.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8249ec54754969d62002b83a91a65297/sogikivuxirorukoduzem.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0e20654b024ecfafe91753013b7a111d/nalexu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce64890b8e---guvujanokedovovazola.pdfIn PDF document text
    • http://zjxfjc.com/uploadfiles/files/37641164636.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/vaweborugumozasikewani.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kanulopiredalomaxukibubi.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/68874048656.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4db7a34c18---9237575909.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/13793709075.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/43883568509.pdfIn PDF document text
    • http://firegallery.ru/img/upload/78517478691.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090508c8869c---moxepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nstse+class+2+previous+year+papersPDF 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_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 17672 bytes
SHA-256: 4545593b70e6e148b4ca61540be56748f949d758663b03dea07ebb3ba9090850
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 10640 bytes
SHA-256: db1aa87a140a9fb424e8575bc15f17eb09706d7bd32b3365d10a48179920dd35

Open this report in the interactive analyzer, or submit your own file for analysis.