Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d5b58f11303969…

MALICIOUS

PDF

98.7 KB Created: 2021-07-05 14:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9dfc3cf2ce4ffc176c8b404e73b52da1 SHA-1: 58be12df9e0b192d0c681ce7c9bd16d3ad1e8158 SHA-256: 20d5b58f113039699d8be5cc30ae5d7e95432e22345d5e77f5dd663eef86406f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/o9fcms3a8udu5soh37akl6pjtt/85456381080.pdf In PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2223c8c7---10621420600.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f975ca0028---direramasi.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/90161cad79c2a04d0c29def50c6a2ff2/6092832319.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/eg1s3c05c58t7ngvd7iu09b51i/41952030644.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bovogakobagonu.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/tamitarotolonipato.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/83844702635.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/54052371002.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/193c6e82516e4973ed770123f845f8af/66047785174.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/05493eddaed5617054657e9b57393f32/fuzodoxelozibozipifo.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/renelilusiwo.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/woraze.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/nu5msffaar3kimpgjdccghg073/89909595700.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4fa2ac45---musuravilofulanakive.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/wowawor.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc3ea47574---tisipeko.pdfIn PDF document text
    • https://industriameccanica.it/file/bokirafetulowifi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bae90969b7---topimuvuposufir.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/332d40d52db0689492ad97f2b59ef776/33992650911.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/lovijisabavubagofefoluf.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/bawufefuxininaxek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=concise+oxford+english+dictionary+11th+edition+free+download+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/zafabotar.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 11284 bytes
SHA-256: 0f3eec61ba9c40af61e793f17e13caebf96d37321a3c74064915b989d9ce18a1
font_01_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13172 18008 bytes
SHA-256: e92fdbb8ff102ae4128b10a1f7bda178fbba0659f368cafea6f7ae4eb5a8e169
font_03_sfnt_off000160e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E7 8800 bytes
SHA-256: 646bb0ea6f1968f19bc60d69e9aeac2de21dc6baff43252da91a4f010fbfddf6

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