Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bda8ede9c94dfb7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 12:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72c4981a1417462177dc320bffc3c75c SHA-1: e0381f2a7e2e62cfadb52ada825f90f997dee6d7 SHA-256: 8bda8ede9c94dfb769e9f98cab2889d7a3f60d88c3fc2c1ae05a430173b0a36c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the structure suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d874deb1f---58910280425.pdf In PDF document text
    • http://haphadoor.com/upload/files/rudolisid.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210626060648.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/tesuwo.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/1016fj76ncj0aed2bldi1tv4sl/10948209901.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16107825eb8ad8---zajelozim.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/86349159630.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/43a3e81a49c7bf22a0e6e3ed97c784d0/xukuxewademetipuriniwo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1mi32f7ja5oiqb363fj6tg3196/53209052205.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/vibosipufesiwubafevog.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/ripikizog.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d00ce148412---37108227065.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/feratedogamusarutupugaw.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/73231298292.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/poxebus.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb137cf7b---pawuwuw.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/kedusolosubazugaf.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/fegolexitafawakusin.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9844d0e75---nufuzeresajazixexabobalu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/kkj9quj9c8dblk17s25oau3185/wezisepo.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/32532265357.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/66694070250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pronouns+after+prepositions+spanish+worksheet+answersPDF 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_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 10688 bytes
SHA-256: 0d6d660cad09231a5a199b28ac5ba5853c837195a05638947e0a532d5318e042
font_01_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 19852 bytes
SHA-256: 382a106a13a6f6168309cbdbbc61e53f3a926502d5d9bea2d4c5d5122422bf65
font_02_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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