Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfa5599aec84d7e…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 02:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08c712382d1eb1cd10829269b295da73 SHA-1: 335557d581af4b80d43e1a72dad52fcbb94d7794 SHA-256: 4dfa5599aec84d7ea5d4b7f803ca77795577acf0b363578157fd3808887de85b
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 WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebb6b6efa1---nipid.pdf In PDF document text
    • http://imi.vc/upload/files/nenapixutokumedelagefawev.pdfIn PDF document text
    • http://fitviewer.biz/files/file/44020501594.pdfIn PDF document text
    • https://hirurgija.me//files/46097790696.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160760ddca90d3---juladupulugokikoludemepi.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/81461069806.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/bemovufotuze.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jemutizes.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/lifapukimabigo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2ivgrrp8gm6as6ls22rk7ejul6/30459471756.pdfIn PDF document text
    • https://designclarf.it/file/libadagojejopemewa.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076955de8ead---jabizifotidewa.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/6307543247.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/25862319446.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/89327758277.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/69752963320.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ed91a766---42190869273.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160aed27e486af---79732880585.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/embdqkotnepq1c676hj142m1ks/keripixadada.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ba209b3f---81842982727.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/vepibalizewogejojuzema.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/81264346116.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/61a9bcd1f654d4b70932d9875077fd31/xisezo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/90440b1bcd91be317eb4981df0d212b3/bujusexuwap.pdfIn PDF document text
    • http://mp-journal.com/media/file/dafopabuxav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=calorimetria+pdf+projeto+medicinaPDF 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_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 20724 bytes
SHA-256: 58289f67dffafd312c2c9f8f050f2e1a5da7229a9b2fbf241af9570d10aeca06
font_01_sfnt_off0001400b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400B 10772 bytes
SHA-256: 3e2f3ad4af17ddadaab975f429824f16e7459d84cb4577bc500a2f9c0ab587e7
font_02_sfnt_off000158ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1