Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f6ede42fa28188…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 07:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39f99250a025e78cd8e7875c6d599f2d SHA-1: 37d29133ed79d675f225d145e51e4ad98fafef67 SHA-256: 89f6ede42fa2818888f6caaa9429b62445e63d16ff4700ea5714b9736f9bf5da
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous suspicious PDF files hosted on various domains, indicating a likely attempt to distribute malware or conduct phishing. The presence of compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.propper-droppers.nl/files/file/49287188756.pdf In PDF document text
    • http://ned.ru/uploads/files/55030640974.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/kalijetamidetewa.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/mupobofogefume.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/xaniwutesirurodiwazoju.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/15782901956.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c707e985b0---vozolibidibimaxe.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a6923ae96a411bbd7565f5afbe605768/mepifiwinowarasugovupu.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/17009007745.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/kofidoragirodogefixuvup.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6de05f426---78781071214.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/luwawutejogowawas.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/37490258670.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/tipatumabubemozepegunedu.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/tifebutipiteku.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d8c1d3a1e987d4974ba0dae260735741/kovap.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/piwoxuxubipikikemipirori.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rf1rgf37h1dfuo2ei4om7rsek8/vefumudizi.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/27839304980.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/4675238247.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9158ba756---76470992323.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/qpivih2fubfauinr6epfnuc0om/siwabesujopa.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/26443266149.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/jogobi.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/97125631621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=used+manual+transmission+trucks+for+sale+near+mePDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 16828 bytes
SHA-256: 341558793a458a0663f940551f20bcb4f5d35f04ce7bb07281003f20f8c84dca
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 10836 bytes
SHA-256: a1bcc274032c536c9fc54d9fad5d350d68bf87b23a2928ef342ca819fe04c3c4
font_02_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1