Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef2ceecbb5181c4…

MALICIOUS

PDF

77.8 KB Created: 2021-07-12 16:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2ca7f27ee3e14a5ccd48295ed32d403 SHA-1: aa5fb54cb3fef548aa59fb15f64f318e0c83fcc9 SHA-256: 8ef2ceecbb5181c42aae23b3cf2f4d859fedf011f29790c00052c458d2480f00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and UTM parameters, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://inwebjor.ru/uplcv?utm_term=turn+off+pdf+security
    • https://alutat.com/data/file/sijeguxasepe.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/svu1u34bta049g8eru9fpvs962/jiruvivefejevex.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42d885fe6d---zefinavifupibi.pdf
    • http://kapelski.pl/userfiles/file/9052173150.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e38140e8b---62145650993.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/oopcclln9ja1fmego5efrs4r4c/lodanogatovilowipik.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57bf5048a---39082040577.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949026314aa---josag.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1848c92bf---penojimaremosazo.pdf
    • http://messtores.ca/fck_user_files/file/36416844750.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ca536f85---sijudewinubiko.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826025b6a73---69340929051.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/2f463aa3a3fe521311cfb84aa604fa0a/zafofanazeva.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/71963917991.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c45c98121c---96505595257.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43cfb6fa02---mebuwek.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/dbdacc75742c5b57e017b99365853b9e/55678675743.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b37ac0b26c8---83785565127.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a787820bfff---8891494901.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/fe6mdn7i9rhddukm5nmljvt6f5/769963887.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iblc7rcveqpr6bass6h6ok589v/nivamowuripefugedufatutoz.pdf
    • http://slsnn.ru/content/files/92545082456.pdf
    • https://mollis.rs//files/nuwek.pdf
    • http://tyextractor.com/d/files/24809683158.pdf
    • https://szekszardportal.hu/userfiles/file/76442757101.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/jelirirobonem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf3a.bin
33add8187e775063928efec9e48322a245e8821c61e80ccee8aaece7035dff2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 10584 bytes
font_01_sfnt_off0000e78d.bin
877619e19a088a4c6caa88dd38a1c62a6d752882a9395d67b29ef7d6093fd641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 16408 bytes
font_02_sfnt_off000111dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 16792 bytes

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