Malicious PDF — malware analysis report

Static analysis result for SHA-256 74acfd498b7e0a5e…

MALICIOUS

PDF

73.9 KB Created: 2021-10-01 16:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00f0fc604c7b1b214351d2b81d04c00c SHA-1: 9d99a257e5598aa67e8923b529812f63b9f5599e SHA-256: 74acfd498b7e0a5e44bbc0bc9cb8d2f548bf28ef31e870b13208d775094e0af3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=aladdin+full+movie+1996 PDF link annotation
    • http://chekeeh.ir/basefile/chekeehir/files/fosobolerafalixo.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/nupopalenoragad.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/vudowagozot.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f338f20dfc---99600292883.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/75516671024.pdfIn PDF document text
    • https://upaspor.com/resimler/files/2247439509.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/xujirewapetujoferezo.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/gogabugikugiwapo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cdde46aff1db006e4c814795f8c5e5d8/99781774264.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/d0347da35cf7ccf088eef63582f3822c/66033989265.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/93238318521.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/b1phmhk2bahtpsct6e8vtn7jnv/80438946215.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/17130852595.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/21254728082.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///zimuwosaf.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/tuboxipetebeza.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/96109244954.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a5732258224cb984fdb85666a564327c/kupobozizizadebaralefan.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036b7e3b39---84707459924.pdfIn PDF document text
    • http://artcvajk.friendship-match.com/upload/files/19569085829.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/021937231792.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/53548813076.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/36102575582.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_off0000b934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB934 18748 bytes
SHA-256: 1f5ef3db84c9a070526a03c4b34dc9b396aa6ff37ae7a378c50aa2ffd50f3343
font_01_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 10684 bytes
SHA-256: 7c4cdf413844d133f6315eecd81946d0dd74defad287f916ca4eb88dfd28c304
font_02_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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