Malicious PDF — malware analysis report

Static analysis result for SHA-256 924e55e2ee9f6419…

MALICIOUS

PDF

85.2 KB Created: 2021-07-10 04:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bc350c7d7395d0dc9a044ca1217163d SHA-1: 5d47685897cbcaf086cba86866d8fe4af558ada6 SHA-256: 924e55e2ee9f64195494b59c5987edca3744b85099fb6886aad60bc808aa9e2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://emmaushuis.org/pages/80457247378.pdf
    • http://www.vljainandco.com/userfiles/files/gufazesob.pdf
    • http://bhhangkhong.com/upload/images/files/xukuk.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1e3a4c667---58283744974.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fea26898e---79243372344.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ecbb2aa29---51496457942.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6cede9f3f---20951447010.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/381c965885a6cdce9d3788733d0277f0/zufedupaw.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210620_B65090918D7AE61E.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52f48fb25---34515195991.pdf
    • https://ctapigroup3.com/contents//files/piwevosamevetaliz.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b340b741056---39839988226.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c18d516aa4a---sigulagotuzivedopib.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2c65857d0---fegofatetufu.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86bc2fa69---mirizofidegajalesixepep.pdf
    • http://panziofabian.hu/fck_kepek/24920640850.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/21436930860d8da2a7b613.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b6976dfde---geguzar.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7eoe36unme53g5aqqpvegrdpvn/lifudavelobawobekokilago.pdf
    • https://termoformat.md/img/files/nisiwekepiruxe.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/358304e0525273fd39d4845b5b9aa045/rixubewewipejusikud.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/c9spm9q3uk73juaevbhj94qjm7/wofamopik.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rs7092k3jcer53fhlpjomjlai5/99967599523.pdf
    • http://energo-market.ru/sadm_files/31149430064.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5719100ec---doratoxuxefikuzod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=guess+who+card+game+rules
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb79.bin
c78e7a84f452cb2cb2e059c4ac9551dfdfec5941e763fa82a1fef334ba1f3f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 16688 bytes
font_01_sfnt_off000116b8.bin
cce54e479ff146ab3e263f16647461f7510094ef6acd6a2de059cd79ee3acdf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 10748 bytes
font_02_sfnt_off00012f53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 16792 bytes