Malicious PDF — malware analysis report

Static analysis result for SHA-256 710e1fb93ca64fe1…

MALICIOUS

PDF

98.5 KB Created: 2021-09-06 06:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee85c61bba16cbc8995db649b4d972b9 SHA-1: e35da50e021d0cdc9bc5e6e1f2dc935564fb33d1 SHA-256: 710e1fb93ca64fe199828b017651fb98a27c6e7f07fe65a77862fbfa4cc63304
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5a3c705ec7686f527e6cb039a5e0de5/78452855559.pdf In PDF document text
    • http://ciarajewellery.com/editor_upload/file/dejes.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/tobixagiferuxigiripizugi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d13fcbd3cb91afa6fc42894fdb71e39d/60925287512.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/12981848630.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/baesncf3jjd3c6psro5pj4e4uh/69810464131.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5baa2543c---12387160641.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/zapateg.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5420e6855b16b7bd57d89d68e744975a/xexag.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/81397758585.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/tufutibusaxebakalin.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd81f078ef0---84486545681.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/96179967750.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/92640066551.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b9430851---87125418108.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce257ad832---wugibabuma.pdfIn PDF document text
    • http://okvin.org/userfiles/file/pavubosoba.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///20749889845.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/wuledukaxusiduva.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/gaxafataxomonopaz.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/78351aa1f5d8449ae14f8d768ee0b370/99442503497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=brainpop+atoms+worksheet+answersPDF 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_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 18192 bytes
SHA-256: 88620ef95669e4663cf8aee46cf823468fae6c9d8596922e4b5bbb1e8b4be9b9
font_01_sfnt_off00014beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16402 10704 bytes
SHA-256: 6d1f66de4b410fabb292c3747f8b603e6ca6c4750f893742d90d4f1ebc85f62a

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