Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48a556db0fdddf0…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 22:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1bf315c732bd3b53277377381936e9cd SHA-1: 9c0c66034c730f1a94fab58f30699f47d9c7963f SHA-256: f48a556db0fdddf0ff80f26e34c5ec423c75f905a2c01e6ca69254c5389a2b35
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

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://chinalabware.es/d/files/vipegoxotifoleg.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/143787357460fb8f4fbb94f.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/73832742549.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/wewot.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/vkuas9cp7baie4kh1da970q81q/40620354931.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0714c49a58---zigilofulizam.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/parosilibojorutumibilod.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/23d799353a5869d79f58f2ace2abf816/65427335318.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/22794199088.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/dufudutimurinibube.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c824131c5ba160b899d5feb782e7394a/31941938635.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9nfqel2cavoa0jhsm7gp68533t/gesig.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/46542dbf2b1608ffe84dcda9443cf20a/tinenigutisujazedisu.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/65433706064.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/gojomusezujorigobipaji.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/fegurezodek.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088300cc73fb---20398075906.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/f7677bd50dd6793b9dccde280b708262/lurinekobodi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/42791309597.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160827fa0b91a2---moloninujigenusebu.pdfIn PDF document text
    • http://chipgene.com/image/files/20210709_121154.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5918fe19bd2131cce18157a644474c44/zeziwelufixoxejan.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf9476757---xalog.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/57663992431.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/21349170899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=adjective+practice+worksheets+8th+gradePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 17492 bytes
SHA-256: da28f6b357d06bcaacd283e095e5e6b06afc124f1c61c2ce4fc82aed23a7df91
font_01_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 11208 bytes
SHA-256: d4635bf7e26b33d68dcf989cfb242eb5a872e02da1859a2eda24d1e7f1e5a3ef