Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a428075b378d4b…

MALICIOUS

PDF

90.2 KB Created: 2021-09-08 22:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae5b9d07054b0b35caea374d1b320498 SHA-1: 80b1748865dedf9dedfea8e2fc3a251a076a4794 SHA-256: b5a428075b378d4b3e318de9b5876884e594e00dc7d8c10c199dd02bf5c65a6d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several of these URLs point to compromised WordPress installations, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://coretry.ru/uplcv?utm_term=best+bass+booster+app+for+android+2021 PDF link annotation
    • https://parfumzone.ro/files/file/99413702992.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b42f5c361---fafowatekopotekumov.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/96b40eca553a724338af07f6bef8e890/4104774556.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cc59a13f986976d2b10bf7af15bdd4b8/vasamejiguwovekiwovip.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/19682101713.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/wavodapora.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/tunolaxak.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/fadevaras.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370e79d57a4---85804258809.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/69482871289.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/fivuw.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/97601719424.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/38208608864.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39dcb0af6---35496620582.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/69057839997.pdfIn PDF document text
    • http://usagimatur.com/files/others/14806238563.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/1091723229.pdfIn PDF document text
    • http://hzqzg.com/d/files/guvurakeruxokonoranowi.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/ginibelunazunejobivufe.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/metafa.pdfIn PDF document text
    • http://canadanur.com/resimler/files/sokowowa.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4d7a15002f5766544eb32327ec8a6ac1/35116605382.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/rabivubokop.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/39532834831.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/36700088825.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109052224063644.pdfIn PDF document text
    • 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_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 10932 bytes
SHA-256: 39d3f61b4891a231e665b767eb417756b379713685b31fd0055b3ffc752609f0
font_01_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 17892 bytes
SHA-256: 5aad57f7b7256b2177bc9068376b2047c0eb3d064dc362678c799082421fa602
font_02_sfnt_off000142a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.