Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35d7e596771f22a…

MALICIOUS

PDF

98.2 KB Created: 2021-07-23 04:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49fe91e186a3d1e72984a971cc9add00 SHA-1: 7d5e4c58d4283851eb893d755d8928e397413ea5 SHA-256: c35d7e596771f22a5ecbd66155cdf61161ef6ab55c8008270944c7d30affef37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple unknown URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa9ff059e---roraxefisodu.pdf In PDF document text
    • http://axiomestates.com/userfiles/file/87196686813.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/57503648400.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160861c38208f0---77415714718.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/23330055663.pdfIn PDF document text
    • https://citronel.com/userfiles/files/bazuviwugojegekegavo.pdfIn PDF document text
    • http://toonesk.com/upload/vabujodetinanoja.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a64fe1abd38---roker.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/5q7kb2bau5ias6175ld8kfarig/61088562173.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6519dfb9---towodage.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/60499fbf15b2de4c3009ed46e8946413/vaxugilatatereloxofusizon.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/zepurapukeforolorozi.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/23517716417.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d4ba2febb---munag.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/8683057683.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/74497188060.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/72c492cb9e0b00d0600c6cca469e5949/43476958035.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/82e3dc11cef89280b454afd9bd20fa7e/logobeliparizon.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4dba924ce2797ec3c62dcaba1de53cda/tiwuvasokewatibirazeso.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/45909780827.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/57369981399.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6a33d4fb1---49293692226.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/98986846419.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8953376148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gcp+questions+and+answers+reference+guidePDF 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_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 17148 bytes
SHA-256: d6c2de5e77d90436a934c85855fc4d51077a016586eed86a5e9deed5ad43e040
font_01_sfnt_off000147d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FEB 11120 bytes
SHA-256: 7e90dbd38ae7b67fce6221d6b06ce825772d33fa44a0ace3a9413f1d014d4233