Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c835f00a71e3f5e…

MALICIOUS

PDF

94.0 KB Created: 2021-08-02 06:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7472979ec7202cc1ad2f7de2b6062632 SHA-1: 9da37e777c83568cadfcc0bbdbc4559ccbfa653a SHA-256: 0c835f00a71e3f5ea243d16648b24754025d5e962f8fb2d7a05a5cb1f177efef
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. These links are likely intended to lure users into clicking them, potentially leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=cats+movie+1998+imdb PDF link annotation
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/009d5578b4b4830ccb8a8c495af2b723/92115351642.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5fa005035---87258214922.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2181da6b517825ff9b79ba37d1ed8a18/18828383455.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wutezizoro.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/ribirewisujimevuremezexe.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/52f6170064abe78f4b39a009b14180a0/11223604074.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/tegimenifok.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/4eletll1u605e310j5i64m5l0j/31244345.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210629_C0AA85AAE9CFF979.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0fd6c66a---komitiratogatodigetameliz.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/53503142807.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/57694965078.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608994ba9fcd4---kibifakudemimozamome.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/79884878916.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd4a51c03---85031089819.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e487d1237bf---64006992873.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/30916618259.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/sutolija.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082577782152---rexopimokuxizowaposotateg.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da9d91c35fb---notuwokumupusemu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efff9999c9---34384686737.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/74123818750.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/bofakatebufuso.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/pomezoropagitifafa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 10824 bytes
SHA-256: 66eb755ed7c0ccff16c108581aaf695059a7ba9b7d20236c68b705f176e607f0
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_02_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BE 19400 bytes
SHA-256: 2349ad383d0af6d6d78e1a2555cfa67b3a9c335948c017773e15ea9bc70557ed

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