Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a93e82a806301e5…

MALICIOUS

PDF

72.3 KB Created: 2021-07-15 09:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f67a4e22caa068bc700f0f278973fa3d SHA-1: a396ce2133484040e89997d861c1bd12c55e09ac SHA-256: 7a93e82a806301e5e02f5e1a63c9607d0d0f7a5e437820cd04e2d967aead654c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://ketchas.ru/uplcv?utm_term=recover+word+document+not+saved' suggest a phishing or malware distribution lure. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=recover+word+document+not+saved PDF link annotation
    • http://keralabiblesociety.com/fck_uploads/file/83234754722.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2fba2b12b9bd103554211dfe34a725bf/41570798883.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/ca7587db7abece9f96dec7b6c041d1f9/wejunaginisexig.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/23198412926.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e105f7ec2eb---75064205847.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/sibojabobunopasejesijekez.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4524959370---46768739516.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/32834164256.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4slcqp1gne3go3gqa0erp7odp1/83508750495.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6953ae133---fejig.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/bekakajefezakefujedumebe.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608082422fd43---26389540441.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/4c7ea76ccdb8ecdc58c15aa50a6b7f2c/fapuvelusoregipejadexirul.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c75699008da---98330777540.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/rebodatunejolo.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/tefewukisekunuf.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99cccbdcd---pumamowalisilavog.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa49cdc75---gipijemugebezotukewo.pdfIn PDF document text
    • http://citra.cl/userfiles/file/86631374508.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/92a90818d173c786b8a7f5fd574b1725/12969179694.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/83990926672.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/93351296347.pdfIn PDF document text
    • http://superpart.com/files/gabuti.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/94498269958.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_off0000b90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90B 10692 bytes
SHA-256: 251c6d5d2cd18fb7d7633fa382995050a22453de246f4704047252f5a9442e9b
font_01_sfnt_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 16248 bytes
SHA-256: 0b500d8c7ba4b435ed2bd660ff026a90a7e3174304e10ea76815b8594f3d06fb
font_02_sfnt_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1