Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ed3b0123ad5d8e…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 13:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57072b7c845efadf06caac555767b4f5 SHA-1: 4606ac29b1e11c183e3a59f19c49ad9e3dc2900a SHA-256: e3ed3b0123ad5d8e4a1d01e6f54c5b00c9ae2c20f6c4d55775aeb248e88a376d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a PDF link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f00d8165d1---6990295862.pdf
    • http://sisparts.pl/zdjecia/fck/file/96357474294.pdf
    • http://machulski.com/public/file/sufebal.pdf
    • http://alhouti.com/userfiles/file/luzopefovaxudubame.pdf
    • https://martensmgt.com/business_school/uploads/file/lufatawumi.pdf
    • http://mega-stainlesssteel.com/uploads/image/files/fizaragogubexalakalemat.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r7nbc4j64tac87mc4h8lbb8i65/21454284669.pdf
    • http://hani-bee.com/userfiles/files/25021485331.pdf
    • http://jezirka-biobazeny.cz/UserFiles/File/69505288309.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/09e245a9fac1126238640aa3095e082f/mebuzitujomewovidef.pdf
    • http://artio.pl/files/files/kinawebozipow.pdf
    • http://lagunarent.lt/ckfinder/userfiles/files/26686892904.pdf
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/detogipakedomomuf.pdf
    • http://ncdesign.it/userfiles/files/tiregofiranudet.pdf
    • http://xinchenfast.com/upload/file/pokomuxumazo.pdf
    • http://exito-opakowania.pl/userfiles/file/28287817776.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5164a39f---15885157532.pdf
    • https://bem-sa.com/img/file/72695479423.pdf
    • http://mariekevanvlierden.nl/survey/userfiles/files/3253603427.pdf
    • http://enricobarraco.com/files/vemijaraz.pdf
    • https://beautyyaurient.com/editor_upload/file/ribixutarapoxokarofad.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/gulakujedoxunikodoso.pdf
    • http://apsara.ru/userfiles/file/21829002642.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/fapobekinasubawumafa.pdf
    • http://wsm.hk/images/uploadfiles/file/71462606211.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=backup+notas+android
    • 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_off0000ea71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 16792 bytes
font_01_sfnt_off00010288.bin
fe70576d34f01f7197ec6d90ab49638395bbf98ec6a418eed42c12acec927a46
pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 10572 bytes
font_02_sfnt_off00011ad8.bin
adce2405f8cc504f1216c4e9d1eb7926c25c4fd06c39177cf0f9f88281d43aff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 18040 bytes