Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fd4f5012aa0556…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 03:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67798c3d6bdcb58f99d7e3830cac627d SHA-1: 7da480e0692ab2797a46ebf24a480b774811a236 SHA-256: 12fd4f5012aa055646583ec50bf8a37d4241d422a9abb395cc9ecab38b2fbe87
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised CMS uploads, suggesting an attempt to host malicious content. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure indicate a likely attempt to redirect the user to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://nedirajtebosnu.net/userfiles/file/gudizopovup.pdf
    • https://censcakmu.org/board/file/files/83718101242.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a4c2d26c081dd51e6ca0b3884e211f11/44243520725.pdf
    • https://dancleland.com/img/upload/file/pawatowivilemagake.pdf
    • http://kajsanordstrom.com/userfiles/files/52245974366.pdf
    • http://gift-founder.com/archive/upload/files/28574104804.pdf
    • http://stefanourso.com/public/userfiles/file/xufedefomozepowibenodi.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/17ouqgr51mubb3h23k63nlve75/xuwekugedosizoxezefivetex.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608485e3705dd---26845647267.pdf
    • http://euroambulans.pl/userfiles/file/goteg.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf26ed631b4---nedobuwufujarunosaji.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eead83d391---55694510246.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160778534069b1---73774996306.pdf
    • http://anjilh.com/uploadfile/file///2021050123060430.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210610_D62967DB620F01B1.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c55e8e01b8---jugulunob.pdf
    • http://monterroso-construpuntos.com/campannas/file/20762036603.pdf
    • https://sanagustin.cl/files/37406276092.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b168c86acfb---86271122090.pdf
    • https://dennismaloney.ca/upload/editor/file/68617220163.pdf
    • https://ivanda-commerce.hr/userfiles/file/79626221613.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/p8vot12vrrvg5cmboanh7efta5/20955876744.pdf
    • https://digireg.dk/upload/2808699328.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3ca7f7ab646c17a49a1a706e3ac591ab/86640163992.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=q+skills+for+success+reading+and+writing+4+pdf+free+download
    • 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_off0000b55b.bin
9fe43fe51d2bcd18484a9290cde551b000c245b8a943252d66836beb90fdabd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB55B 11208 bytes
font_01_sfnt_off0000cfb1.bin
070170c7f0d47d296a2bf947115e21c014946b977fed705093bbb288de4fff47
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 14236 bytes
font_02_sfnt_off0000f301.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 16792 bytes