Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc76f717b69e64ec…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 01:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb77591a96d1253693f0bf245245057c SHA-1: 316e11e82eeea74f3ef9a07dc525fe8699e54fa4 SHA-256: fc76f717b69e64ec3e259bfc9018c66bf4850a74a77863618445c963f4eba6bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an intent to redirect users to potentially harmful sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=fill+in+the+blank+song+lyrics+game
    • http://gocep.org/data/userfiles/files/tubigiwevujikirepukixox.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/jte01okchusqtguj7f85ueabbe/45390238306.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097069749661---xotubenaputoxumododizepe.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/393df9047c7fc6991536630506098301/36439692568.pdf
    • http://alkanboya.com/files/file///notopepimesu.pdf
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/zabepirotewadijopal.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a20f79219f5ab5e90c777ae14ff55dde/xosasodeloditojedes.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/85262744446.pdf
    • https://kopari.hu/files/file/resivofuwumunod.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/31400739809.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079118a04fb2---pumemafuzab.pdf
    • http://shinex-auto.com/userfiles/file/11612817351.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a54b89fc---soripepo.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e3d853dea1168a38b7557b10e08533c7/zawakedanel.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/40d2d73b9614e9c93ea29c3cbe61a36c/90546814028.pdf
    • https://ludifrance.fr/userfiles/file/17467406944.pdf
    • http://laureysnv.be/uploads/files/zifujo.pdf
    • http://paillasse.hu/userfiles/file/42924090697.pdf
    • https://chp-travel.ir/data/file/7938037166.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea601b093---66634235728.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3ddcciuk9900gkeesdb2768jd7/42803205480.pdf
    • http://alimentosldm.com/userfiles/file/42236834014.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4e989461---tamesato.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/c7219cv04q67i4s80b5gjoqbe6/rosiseniwi.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/15786665413.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_off0000f3e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 16792 bytes
font_01_sfnt_off00010bf8.bin
e25cac4fa352cd3825a13eef46bfb52b8d55b1b2a2b4f14d93c84e2a9b011b8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 17520 bytes
font_02_sfnt_off00013a2f.bin
b4a1ed60a4d19d28d5b27de19e4f5f1e39ea0e00eff27501782f1620574b052a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 11000 bytes