Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d25eea7bc21e4a…

MALICIOUS

PDF

94.0 KB Created: 2021-09-02 13:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1cbbd082b4f546513c85ce1d70eadda SHA-1: 22d43bfafad36e9f9e34839d1fe4392abeb1f67a SHA-256: 73d25eea7bc21e4a2ec9a9a41f0e4186fb8ff45ef3d3f6c9c3354b4dbcc54abf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://nomylo.ru/uplcv?utm_term=simpson%27s+3%2F8+rule+pdf PDF link annotation
    • http://psn-monolit.ru/img_file/files/nipigajusenazixapurar.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0328775af---17052310760.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e6f8091fcf1b018c12ff974d6a85e8b2/28705730544.pdfIn PDF document text
    • https://zzwgjx.com/d/files/42273853822.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/25719062938.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/42265535093.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607101b349ab5---27524694287.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6292afd4---20699053727.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5940831dd---xugoxe.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5ea23afb34ad67d5d1023ef17bb979cf/42820567908.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/xoreguludodirasefo.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/74760248311.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/goxade.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4023362f---mizubusodewuvabizutog.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/r1plofgodheicgpr58pnunrio7/temivi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4e05c7b26---40643359834.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780aeed1a20---4015327441.pdfIn PDF document text
    • http://potya.com/54334238392.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/63b5ea738f923ccb3467be5e26ac46a3/90345195630.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/joxoju.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/45399783513.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c949a2ed9---76352787222.pdfIn PDF document text
    • http://yuhongzg.com/d/files/jowemipizanezusavewuginus.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/16299072069.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/33134075775.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b452c028089---nasuxejorukugufunaji.pdfIn PDF document text
    • 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_off0000ff40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 21912 bytes
SHA-256: a042258b35df94782f7a22d3d860549e5b804e2de648e9206e38f4bd554cc970
font_01_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 11020 bytes
SHA-256: 01611af4d694fd86645a399ceef1e5910c9c18b07d2aef888ae702de178475f1
font_02_sfnt_off00015248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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