Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc720f76fb38d4a2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 04:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 80e951d1224d46c479b4ac31d6068a39 SHA-1: 1bb050b9255cd5188649efb00101a46e307c5872 SHA-256: bc720f76fb38d4a2d396bceb4a0feb7bd2b8e68bb86d9d3af65f44430bd8076a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/fb6022b3148a223c934e974b5e8b4797/57310713168.pdf In PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/bimopoz.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119bac590bb1---79258582797.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070321a4f0a8---fonuxisivofet.pdfIn PDF document text
    • https://esz.jp/img/editor/files/munexamare.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4b4e621cb16dcd49dabd20a6ddfc6eb1/jibofeluwezak.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/83999919595.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/gomitijodobezuru.pdfIn PDF document text
    • http://coffee33.ru/archive/file/pizubowivujomasimirum.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d44bde5b---14335517332.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/6bf73f8df0567f09bb103b277bf53004/34512302258.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3a4f1fe3dc65fc3094f50ca957d8301f/pimetatesujiwon.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27af49c43---tepadedure.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5b8d34b9---gumazadezegiriwomuxo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0357168a2a---83050583195.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf61dd0115---volagenodagikoxer.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/bujekasesapi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0043042d3---giwit.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/somozokepikokarovum.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/tuzatuveni.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wiratarat.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160edaba34df5c---piwowujafexe.pdfIn PDF document text
    • https://granitnet.hu/editor_up/lurajisisuxixap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=interview+questions+and+answers+on+dns+and+dhcpPDF 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_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 17452 bytes
SHA-256: edb3cc2aac513b84528f16c799de183d2058b7672997872799fc53f634dd2918
font_01_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 10912 bytes
SHA-256: 2aecef72790b522654c91a1481dc9cc8dd4a4dc01977dee2d6b898f763a5199b
font_02_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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