Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed409a7ecc890ca6…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 12:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f871f79e9f8d13613efa5f74e2315f22 SHA-1: d2deabfbbcde96d9477a8f40f6fa23feccd7b478 SHA-256: ed409a7ecc890ca6e301e79558abbefe904bd319a6984417ccc6f4fa9e178d50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and embedded URLs suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16094688cdaf08---rozodirofa.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4013bd93ca6e6f104177b846f06f0fc8/kafakajajorev.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086615876048---28524060058.pdf
    • http://amandatravel.com/userfiles/file/bijezaxe.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3ec48e31294454349e20ede989407e8e/lisufukajumumenaloju.pdf
    • http://akinmedical.com/uploads/file/52456570080.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3180b41c80b5dbf97ca2200ee6d71460/20591328461.pdf
    • https://alshamiltrading.com/alshamilfiles/file/20530236062.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5655f9f477---49325446396.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c194e82e---6356094310.pdf
    • https://soalmatematik.com/userfiles/file/fazotetesu.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/abu5h1t9o8sh64mc7d2ika0g88/purijefogozus.pdf
    • https://hashtag.school/userfiles/file/gamivirexa.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/752b57114b105dc19d188bbedf584259/77178559381.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf55999b3---wefagedawiper.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071825e8ddad---xonoruwumobe.pdf
    • http://gramercygrand.ru/files/file/87283143615.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/61879828265.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ab73bb56---88734648499.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a2491865---wutidawezenim.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9ce199367993ac59692614ee03d8f2fd/vapel.pdf
    • http://say-international.eu/userfiles/file/28425154484.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/d3gdtb1ebnjqfgbdeifiie0h7u/nijamezuzejatinekoriw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=overacts+crossword+puzzle+clue
    • 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_off0000f289.bin
6477ca94c7f666caa447d6839ee5b5ab14760417f40703deaeee593e6ecba8e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 17204 bytes
font_01_sfnt_off00011f6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 16792 bytes
font_02_sfnt_off00013781.bin
20dde42c84c271e8ab768ca8e84ab1127e3b21eac5109b9b02f67a7d187583c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13781 10648 bytes