Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a043cf11c72f76…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 06:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a9abdb077e6868b352e98ec0b2944a9 SHA-1: bdd8b8626d4f8adba90836de8edc5bd1fc357edc SHA-256: 23a043cf11c72f762e09e260ea05471f4cb30af4c3951a958a789aa53be49b68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, with ClamAV and ML classifiers flagging it as a phishing or malicious PDF. The presence of multiple compromised CMS upload links suggests a deliberate attempt to host malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca932a4473---32594090792.pdf
    • http://meteosputnik.ru/userfiles/file/53347280451.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6p9be7ch5dtnac6721t2rrvao5/letitamofewezibiwulawep.pdf
    • https://denizlihorozu.com/resimler/files/satotiwubuvapizovizider.pdf
    • http://bitite.lv/media/txt/122/file/90029082971.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16113bcdacdbd7---59170808809.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbafc2d8fc---wipexilo.pdf
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/4115224959.pdf
    • http://olynskiconstruction.com/pics/file/5823293534.pdf
    • http://szsahsh.com/uploads/files/fipejadagokowumawoz.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161008f285d962---75624251432.pdf
    • http://atrsara.ir/resource/files/tedelorejipi.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/83476077515.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833cfb5eb25---dimopuxume.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161156d58734f3---vevigazurixiz.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/799557db4df8d4fe1902604745b509e9/nubimorisufezowev.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/9mcpor97usg4l34tcd5c2g5mo3/lirekimowowipasiruxiba.pdf
    • http://ceramvetro.net/userfiles/file/88102243527.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cf856eca1---70796960706.pdf
    • http://ballard1966.com/clients/22636/File/42364371418.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106d0bb689f9---sirirokolosag.pdf
    • http://medianet2000.net/amm_prod/image_news_popup/file/vetekosajasijunaponisemo.pdf
    • https://capecoralliving.com/media/file/54255330049.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cambridge+key+english+test+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_off0000c31a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC31A 16792 bytes
font_01_sfnt_off0000db31.bin
7dd4feb4416f34b85ad57dc8f2f80e5755a846036defb90d0c2d31d638250fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 11484 bytes
font_02_sfnt_off0000f5d3.bin
a9376b0c1299d39b0a53c7a2776cd1a4ec7ab3b57783c2dbee6f0392d976d4e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 16636 bytes