Malicious PDF — malware analysis report

Static analysis result for SHA-256 33512c90253dbc62…

MALICIOUS

PDF

82.4 KB Created: 2021-07-03 20:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4bec4a30a1f3b81a7acffaa30710ee7 SHA-1: 7551a050066b999d246d2ca6689bb9a5842793b4 SHA-256: 33512c90253dbc6230e0b45ef60711f7f3829559c31c3c3068f03c3fddc84405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, 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 URLs are indicative of a malicious campaign, likely leveraging T1566.001 (Spearphishing Attachment) for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=d+in+periodic+table PDF link annotation
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098329af4135---30656927690.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01cb83f30---37843797025.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/61084414753.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/479bcd1919ce1286f15b37ad3850dcc8/jasaj.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/245fbaea6b595f6ff8690132f2f48894/vixotidodax.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c991673c---32009429234.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5831bd14---janujorelaxiline.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gosogozisidagegugatarewo.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/fikubawibedukaperarem.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/baf15076d8cdb1aa61081e8ae0b15741/xupapadulof.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a545b18a3---puregipanujete.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/abb73ae8f096d77cef606a04edf2b0b1/sikibijoleropikoxu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080106759f2c---75549364135.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/c20jovjqse4p7uo23lei2hnhu4/18107501745.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/37536350996.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/jatavemojisonoral.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/wumezewesagevof.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5396b778---kodof.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e7a15497---tiwataminosetatijas.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/sifatowesoxasovipaxutu.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/bofejevevok.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d6062994dd36be8f1368cc5c8327940d/81368735520.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/jimemepofetuxa.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/83348388065.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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 17748 bytes
SHA-256: 01f6a0599d3a60d75d82ba2606f30aee8a862f7a32fd7b908fa55e0dc1186e0b
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 10480 bytes
SHA-256: 64884aeb4e8e4bc689af149737a7d2d1d07f6c8ad8f278a4f4b58025e531f071
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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