Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34112066dd275f6…

MALICIOUS

PDF

85.4 KB Created: 2021-07-17 22:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5df5ccea6324a9ff1dad4966c9a8605c SHA-1: 845af1e611b486adb527ad24091a08454a8ff4bd SHA-256: c34112066dd275f6436a3215a863b22400471b1bba56c11d460ccde2d1324454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d1fde6cacceea8e89087a091861b8bab/jedazurofivibemudawu.pdf In PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/tavasusowokikav.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/20178472693.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/31802598407.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/purefoxolomavasonubugefez.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/90995318601.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/wudopazifiluvumo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/padivodupugedanov.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791d1590644---9268293698.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/63593817096.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8359ab091---41913774249.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/fcab035699bd397329f8bfcb2aace89b/divuposaduwa.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f9d51762e355806bb5428e5a830f86c9/97723638583.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c48ff20cd---23986005785.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34a5384a5---79089953259.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/bnba5has97jnio9dis3iuo3cff/talisubofovulapixezirilo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f05ad65b08f7758606647fa569ddb5a1/93812439009.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/pomadumuxusukupuli.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/wenarilob.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/71671572526.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/nabofebugibax.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837e8d854cf---24170907177.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/82575949781.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/83c6fa869e357db7a88a4fca54f5401c/guwanedexufogasa.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/98792123410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=track+workouts+for+milersPDF 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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 16872 bytes
SHA-256: eecc4416f6ad7da01793a2bf9f2a7e4352016480797c0461d833b7dff29410bd
font_01_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 10632 bytes
SHA-256: dabfdf9b8e1887043277026d5c516fba692955f361963436a1b7f859c2a9381b
font_02_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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