Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9aa971ffd14827…

MALICIOUS

PDF

79.2 KB Created: 2021-06-26 14:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c47213174b61ef559faf611b89854b4f SHA-1: 8260fde9ac5aae5cc4a55b9065b3b9a8e394538c SHA-256: ce9aa971ffd148277c9962c8d36941d5b19dd3eb2e3151e47aba1dcc243a44d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://bannhuaduong.net/upload/files/71555776173.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/4292ea6ec33979e6677982a6b6c6d223/gonoxodov.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e04ef9d19532e5b97d746a431a75bab5/bipidax.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/21b6ff176ef7dff9b9d548fd8c1b800a/25554255313.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3fbc032cd0d46d7126186e4c5a8e6059/39141179088.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f74750e74---65997325175.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/gaxivofuvibezirejoka.pdf
    • http://www.findvoters.com/userfiles/file/25445494873.pdf
    • http://studiodrago.eu/userfiles/files/86040459310.pdf
    • http://ecogestval.com/userfiles/file/47216918427.pdf
    • http://newo.ru/files/files/nuxijuzuwetipazaribarix.pdf
    • http://rymwid-training.com/userfiles/file/lazazosur.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d34341d77---nopimajikijufu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/69063d4141dc7a3e4c32620c821a49ac/kijuverekumovoja.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fabbfe02bb---tutiperud.pdf
    • https://tvsporedi.si/vsebina/4829263692.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074767f8b428---31286074024.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e9a25f9c039a25116593f0f516c30e82/popuvowufuzojakoloratifa.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/l3j844hklvqb9c1ead9ns46h56/lajunamebegarupugumiki.pdf
    • http://sistersaviopublicschool.com/userfiles/file/68029716561.pdf
    • http://littlepearlspublishing.in/data/eimages/file/20805910691.pdf
    • http://spreewaldatelier.de/img/editor/file/18577905753.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd02dcc7a---fafofivonepapigozij.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a148fb3e95b---89819884386.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=year+7+biology+test+papers+with+answers
    • 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_off0000d16e.bin
38467d5aa7f8bba6bea5e36d24b0e451c23f551b262a11986294a860b6d7e2fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 17104 bytes
font_01_sfnt_off0000fe79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 16792 bytes
font_02_sfnt_off00011690.bin
0191b3f5d8205bee31ec68930bb70ae340fe5a7dab1dd6bc6f845d412a9e158e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 10904 bytes