Malicious PDF — malware analysis report

Static analysis result for SHA-256 730afdafc2fba228…

MALICIOUS

PDF

91.1 KB Created: 2021-06-10 07:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b6bdcd17761848c0c2cac50ed8690297 SHA-1: 042c0317ee8f0d37ed8cb84ff586c967b85ccbaa SHA-256: 730afdafc2fba22875ebb623cdf8286718ffa7a94b7789b0df956a214fa4364f
164 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a download button lure further supports the intent to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=movie+synonyms+quiz+with+answers+pdf PDF link annotation
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/h1mjr86sm3bd9o3jbbhek21pto/xopefufido.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f43f4c652---36616804972.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2b4ef9f6---naponidemapolunab.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1ec59e110d2bfec4db8d411feb132344/jirabapedobogavidid.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d0f8cd52---kutavirodow.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4004f98c2e---42511241205.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/diziwabiwanojazowazamam.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/sedekigatafenem.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0e2e3105e9eb1ea1e3aed1f94269ba9e/fodumerunugiketifuwiwu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/679ba05e58c935cf67bb3bdefd45dbe2/rurazutuwomuvefilegozopa.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cb7hegc1uqe6a6h7rioougs062/18084641496.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e805357c41---forirufetid.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e0558b3970ad8b2756e6a5ffcf645a25/38186633890.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/34b5f34aa5035f28fa8817f1770cc7ea/deduxi.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/jlilidldm8hf0khr74amlg5lmp/1023097887.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/cmf0c6lkoh6h5e5aklr0hbj1ia/jegidiwoxerul.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/surikefolajodukikikusip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 5568 bytes
SHA-256: 69f5f9e7219e6f4994a4bc85ada9d2f38f8548d0a36d52f61b1652b9e59c59ea
font_01_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 13504 bytes
SHA-256: 30b9b02707a0a3357097018d7723dcd67880902c8d23c65bfd4a79913f2669e7
font_02_sfnt_off0001515a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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