Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6b4ad83f525702…

MALICIOUS

PDF

100.4 KB Created: 2021-08-12 16:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 433b644b75fe7a6c5f38ab0e81bf8bf0 SHA-1: 4a650894d13efa63b0234e4c494527a37df8c279 SHA-256: 6d6b4ad83f525702cc4dbc894ca7e636af213008b3b28b8dac4c40846c534641
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a raw IP address in one of the URIs further indicates a suspicious distribution method. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a3b4d15b2389e2637a7915e1f91463e2/xixuxesadopikupigogipeke.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e724579ec---29738052690.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/wowimubazizotujimoxu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pmlkj1745akbh0jfjpoq5taf4c/dijivawenanewewokadem.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103f4d1605c1---bemazo.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/n0aee85arb7od1v6eb4gfi7l3s/lumesuvebinerimaramirala.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f826af4f---lofisiwapizunixus.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a68f630a2b146a94ed7d80ce524e4b29/21514992729.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/xuxirerupomanedupet.pdfPDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bfa2cd8b9---parusezusaxefu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5db916235---gegitimolanonewewogeli.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ccd5b45244524fb7445471d4523bde0f/12942964869.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/barozugovis.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/98084716361.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/53930287498.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c3bba1bd13e84b6ae27b87d28e006d2e/rajejugon.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/xukexagi.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/muvezapirur.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/12212056317.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a50439e59---navezosuvukevitavitodut.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/ganikudufepapobidixagi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a804e9cb1fa---26698394336.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/sozesijudizasevakedevuno.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/60419035205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+words+start+with+prePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off00013f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F36 17144 bytes
SHA-256: f70e18a7a91133111fd51d25959ffaef92b296e710e44cb29531054bf0bacae9
font_03_sfnt_off00016bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD0 10420 bytes
SHA-256: 7b94ec821f253a99187671eb4a8a0d7cd8e942586b381a67fdc0729bd278ab7d

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