Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71e3808b9105225…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 14:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01e704bcc5c992e0b0d09e16ed497b00 SHA-1: a625c21cea706b7bf429b711b010548e82504b50 SHA-256: d71e3808b91052251a8577c0ae02560afb168f6bfc8dab4c5db36edf73e6a03c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a dropper or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0vdmn6g4m04a517nahq9jo9n0q/mekafo.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7938768c1---valagewarowemi.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/3278391365.pdfIn PDF document text
    • http://sushi-belovo.ru/files/71537281898.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/fisimiruwewa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/japuxi.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/41559670121.pdfIn PDF document text
    • https://doitoutdoorz.com/file/v6fcKPJQBFhS41XV.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/68241645604.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/noxekudi.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/xuragoripipofeterusa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2427049d---perevamowurularizegaxana.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/nivufunumigaxij.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/zatabotixezuresu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1e4258ddc---mevasapiz.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xibukevifuwedun.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/val4fkbtil6fqu2gao5gp1o51g/87028173119.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/55342984575.pdfIn PDF document text
    • http://artepcb.com/upload/files/69916970562.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/45352735526.pdfIn PDF document text
    • http://amdind.com/userfiles/file/84279760864.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/tapuvajagugufori.pdfIn PDF document text
    • http://geotersrl.it/file/55039503452.pdfIn PDF document text
    • http://osayit.com/images/file/xubakilusegamivom.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/bodibal.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/1004974244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+play+san+andreas+on+androidPDF 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_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 17764 bytes
SHA-256: c1c49b7c838d8292f6a5bfaea65bb075754589b24109fa822ce9a149ab1bbb95
font_01_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E55 10576 bytes
SHA-256: 6a1a5153f7ad2d616497dc2a5d810a4a50aa00960dd91c570baba780e3b1feca

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