Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7fe9de3c2d9796…

MALICIOUS

PDF

77.3 KB Created: 2021-06-30 18:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6031e1b44d04e5621dc4eb1be0c63e97 SHA-1: 02d5bcb6f3a9bb7da1e66fdcfb74e1bb965c6438 SHA-256: 4d7fe9de3c2d9796e7ea06a237fac85f2a70ee14cafaadd523dedd051bc40e30
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the ultimate destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=watch+the+chronicles+of+narnia+the+silver+chair+online+free
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/nfn2v95e6um3569dkujeqc03rt/4035981727.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f9c15381d03fd3f15e6b97dfbac22338/13005634768.pdf
    • https://capecoralliving.com/media/file/24985026850.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc9795b42---dewisarogidefevimopukorek.pdf
    • https://daismene.it/file/fopepovagenitepalud.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51db645b32---37145900622.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3a49d0c9cb221a7a3f95b95617dcae37/joxexakozowaperozukumeloz.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/xizawopebudejiz.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/js6kvkho5uaf1pnu91gbbkvteu/bijixerelif.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb12cf0a2f---39566186125.pdf
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/zowiwux.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0faec71fd---rodemowo.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160921ada16580---72786563878.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a5b9a5b20---rijaz.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bs22l7499mqo80uuh5c1db850p/63631627473.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/98340277832.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ca5278d2---wixogewaputupetonufil.pdf
    • http://profitoolinfo.ru/ckfinder/userfiles/files/dezogusogewitisozosita.pdf
    • http://feynburg-uhren.de/uploads/wusadunovalamus.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa935c785a---17615913741.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a320829229f---vibawuwiravazumaxab.pdf
    • http://biomassasia.net/data_ed/userfiles/file/82439520871.pdf
    • http://nesemlak.com/test/images/uploads/files/69979167702.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/59bdf07a25aa88ff3d109ec2b9713cb2/vududusasek.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_off0000cba1.bin
5b905bf592322059bcf13d80d9a913e623b9847cb13b2cb2bc84388e011dd482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 16724 bytes
font_01_sfnt_off0000f75e.bin
5469574585ce25bc3d1d8e2be9c2409b26a0ac6554f115ffa7b988dad3bf5fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 10492 bytes
font_02_sfnt_off00010f37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 16792 bytes

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