Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d4fa4db8a46a14…

MALICIOUS

PDF

78.8 KB Created: 2021-06-28 01:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c04c7b78145620a419f8c685f1498cd1 SHA-1: cf1bafd4f30a78dc3be84aaef5ab4db3d8220a8e SHA-256: 36d4fa4db8a46a14ee66a53f5730f3ff593544f74ffe9bac044879dcacf0aa02
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=labour+party+meaning PDF link annotation
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/dmpihsa6dk8nbatk9pre7e9k86/52962972267.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210516082819.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/29902957263.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c07c21677f8---jipuwaki.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/lokodawef.pdfIn PDF document text
    • https://akemi.ro/hirek/file/zatejokukoremuviw.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/47262838893.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/xatujupovelijuw.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ded3a4b698---wigafitunugo.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/suruwojukobajidozitawudof.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051320191562464.pdfIn PDF document text
    • http://chayka-svg.ru/files/11394069024.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd0d754754---kobivibodufapuwagowi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728a3e4d20f---gepiwepawu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c747c2a54d---pojexabimapur.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/an6jie8q2v277bqck05bjslp2n/96449077205.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/a6b9f5961bedbc31e575e29bb26735d2/tukifapamatotigogo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc3d4ab9ce---76678912700.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/fixukunilumokof.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6cf6ba34d---55382592153.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f6294a7f8c071d61c6154ae7acb478f8/loretazemisozorubapig.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/77562086822.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f6153dfd---98921525771.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/in3al7k4ji9hnl3plj1v12covu/15608305580.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_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 10692 bytes
SHA-256: ba13a58d054cf555e0a131f852d305a7107b12b866bb59e2e057c9029d93efac
font_02_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 17916 bytes
SHA-256: bee3b8dad1973bd9d1a3e7947ac6b33a0476b3f187c524ceee5d91f33a024dba

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