Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb6fded968ffd4c…

MALICIOUS

PDF

82.9 KB Created: 2021-07-02 06:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7339f8e78b3b995135689b01d631aa9f SHA-1: 1c7c3eedee000cb6164a1b7bb582bdcabc5239f8 SHA-256: cfb6fded968ffd4c78fb5ee2b2951c240bcf084a4a0e891c7cb442be014809db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bb846013---pafizax.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8adabb1f4758067d335f8fb6d628c49c/paxajigadabonoroxedetet.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc1a568bc---80640164644.pdf
    • http://cancercareresearch.com/userfiles/file/9011583332.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c4782c962c157efa949464993ab0dfe1/jurixopalo.pdf
    • http://turagent007.ru/userfiles/file/zevufevevomujogebikovutel.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160887de4119e2---64937530308.pdf
    • http://apsara.ru/userfiles/file/volepizuzosajunakofowul.pdf
    • http://coumert.com/images/file/43011012043.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/gisotadujegazefenaju.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1a704d461c25af7157af91fe17f4a163/55478370433.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/96194162907.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609688f3e4fd2---kokuguv.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f4cbb800d---rober.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff6dafbfa---38051191171.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091e9f4a4d4b---63591904056.pdf
    • http://superplasticizer.cn/d/files/96761414971.pdf
    • http://mispuntossaga.com/campannas/file/xujegadukulipibavug.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210604_154340.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a150a61cc3---mipaguvibenuwavajugozibiv.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0909c7af1---50290039219.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/36152980765.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b353c0467c0---sawaleguloratijaw.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/57113992009.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6a165a8ab0e76c3e51ef517621010b5/nibixifixadaliwadiwani.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chapter+14+mixtures+and+solutions
    • 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_off0000e112.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 16792 bytes
font_01_sfnt_off0000f924.bin
ae128b8ed940b3c5e534c9f3c9d2480069af376be48f9085bf6bc2a0521448a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 16648 bytes
font_02_sfnt_off00012495.bin
9a754377a3cf0c978c61392ca562b8995c956e1dcff01b1d87b216855578af33
pdf-font-stream PDF embedded font (sfnt) at offset 0x12495 11020 bytes