Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6bb748ccd199c9…

MALICIOUS

PDF

94.2 KB Created: 2021-07-17 21:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 54d1d51475459a0fe53e9fecac9958ce SHA-1: fa82c9ddc3b8601864db6bd5941d9e9e2094ef7d SHA-256: 7a6bb748ccd199c956030c654bc9f77928a6eac9078ec450e1cd77b2df762cdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting upload directories of form plugins. These links likely serve as a lure to download further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The PDF's structure suggests it's a link farm designed to obscure the ultimate destination of the malicious downloads.

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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0cb3222eb83acfd816d01cad3def48aa/78441772968.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099816b17a75---sewivexupuzesimewir.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/74140456310.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/baruvawoxiloradeso.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16074014dab669---vuferewegetexopa.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/733f94e99fd4736242a09f3dfc713893/44469152840.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///vufuf.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/56153179166.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/nesewiwemotedexataz.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/14080202405.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/81781240350.pdfIn PDF document text
    • http://brlairport.com/images/file/goxarotojidetofudovofu.pdfIn PDF document text
    • http://vejwun.cz/images/38863849606.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ca28e6dc97aaf8b01da9367ef2e8032c/dadiduzon.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/5ed14ee7b1885a642d5d2a404ad1ff10/53432653367.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/78944645289.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5835edd4d---koxori.pdfIn PDF document text
    • http://12shio5.com/contents//files/49540174839.pdfIn PDF document text
    • http://medica-brno.com/files/87221671326.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/2062a66f369765d4ef6c504e584cebdf/jonovesutetudoledasesu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f030d0ce60e---miwutomufabe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/63465843495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=white+macaw+parrotPDF 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_off00010d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 18092 bytes
SHA-256: 82af484c05edab0a69eaadeb029423a81a67db602849518280270f794d6a23f4
font_02_sfnt_off0001543f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543F 10400 bytes
SHA-256: 7cd0b028487d7f92d2dfbac491034e0e1a54f74a6c4d0bf51bfab398dfd483e4

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