Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1c5512b6d775d0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 19:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6307eae7326f1f024e38b58ccb7228c4 SHA-1: 8a55ee43f11980b31156f7889cf0fc6c830afaef SHA-256: cd1c5512b6d775d0620fb2cef33c3e71380edede3d18315f82d11b28f037dece
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/q6crpfkt4ldkdrn43hu59l2c02/66631382577.pdf In PDF document text
    • http://bitite.lv/media/txt/122/file/14162871428.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/80996277334.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3e6d5027---gijavekodiropikaf.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b411b0b7f3db900bbe958c423b5e15e3/julirofafaboxerafos.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecbe86205b---nasum.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/jalegiwowijepabogav.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/prnsspgnniasbc8pk6stfm58n6/siwejaxesufededaget.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/jidamodadejedekofuke.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/sumizopunurimijemowoxaj.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/48804278650.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/7073199994.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/33c9c97d9c81432a4f4424d8783d91b0/jejededojo.pdfIn PDF document text
    • http://usmleworkout.com/files/file/kefebugemilasifoduvez.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/nojokumigezipi.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a39c8ee0---suluvotapizojiz.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/73714853942.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/808363518.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/ruwasufoguforif.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/47798929385.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/jbn1j9oq3efru2g5fi0ojp6v09/kikorizida.pdfIn PDF document text
    • https://bnovum.hu/downloads/93572488128.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/61558456154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=palabras+esdrujulas+sobreesdrujulas+graves+y+agudas+pdfPDF 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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 10932 bytes
SHA-256: edd1e08d68f853527a6791dda5d20bbb4e2defb663aa32c2e7801f6977ec8357
font_01_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 19556 bytes
SHA-256: 1861f6dfe67c42ebffe209f425f6380f121ec1a7221f7767f666c24495631f78
font_02_sfnt_off000125e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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