Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e509b17c35104d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 23:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a36bb28e76d0cd529b7c9a172684259c SHA-1: 984e683e2d921ef502cdc409fb54aa920ccb5aed SHA-256: b1e509b17c35104dae110d64ac8c073bfc3c3af556b7129cf69694cb443559ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3898d33559---44955177643.pdf In PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/50424995815.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/31427457478.pdfIn PDF document text
    • http://kalikraft.com/images/file/gasuzemenurifulexagaleg.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/xuvolomudebu.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/93156715251.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8v1vfgne10t0qdf4opm3tf262c/3244016893.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/25710020483.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/jafiwikapofu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9d5c64bbf19a2cbd832adf091b13b4e8/71054834215.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e458d3060---tejugovezevibeletifosa.pdfIn PDF document text
    • http://makaroma.fr/upload/file/rugim.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/50290197946.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1c5ed28ca29056edd7a920e132b8aeaa/80332209078.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/74427844124.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210717120727620.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/zofif.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2490f1d5a273163eee07e19e6c4a7109/bebajosum.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/16642091189.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16128e7bb1a248---85583231023.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/xeruxizunive.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/bijil.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e022c94c845---budaz.pdfIn PDF document text
    • http://packamate.com/userfiles/nimanurowasosevirebabone.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/powabonebikakazuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=epidemiology+of+avian+influenza+pdfPDF 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_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 17392 bytes
SHA-256: 10d6369f03c05806d8887373f187a8c7cdf3cfb72df001e24d1162b7b286aa4f
font_01_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 10800 bytes
SHA-256: 2eba7bbd5458e4436de4dbcb93b15f73c5964589c054e64b6d2febd41a316eeb
font_02_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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