Malicious PDF — malware analysis report

Static analysis result for SHA-256 21310b07c8782a09…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 10:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5933454ea2255910353b2b729906af3d SHA-1: b656502ff88935e6121e530bc9c6f570fc4381cb SHA-256: 21310b07c8782a0944fa76263bcf027570ceb5cefa4dc29daab12412190c6fac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

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 http://bsp-oblspl.org/ckfinder/userfiles/files/kikegefizav.pdf In PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/79987873298.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161362592daeb9---1785179423.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f2f6a395a92dc3646eed8067ae501a3b/vovuviwakodunipijuzonu.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/nesaga.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/potemipafufesisobe.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9f7664b7baac9f73584d4399f2c9a82b/retij.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/87191078351.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/dizezefitomugeziragil.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/21163466698.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/79523555489.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/kufiwidolowa.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/puzasejivef.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c0103983---limowelejoziwutigo.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/90ec3f5760c918cd25374e5bf4b2d20b/97792076043.pdfIn PDF document text
    • https://combrooncom.com/contents/files/xirixu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/lejeviperifetudizej.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/76934295990.pdfIn PDF document text
    • https://alohasafaris.com/files/xevodug.pdfIn PDF document text
    • http://www.bandungmesin.com/file/wekigezubetowofik.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/xupavafibafi.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/kiroxenikilunapig.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/97397238685.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/nikowenojejogemizuvalege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sushruta+samhita+in+gujarati+pdf+free+downloadPDF 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_off0000b815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB815 15868 bytes
SHA-256: 03f7481f7a6872ce1ee1478715926f1b8c0d556d45a3c2c2da1668347ad2fea9
font_01_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 11336 bytes
SHA-256: 5e0ffdb390e3c8cf0eee33ed8e195133f7545fe3524e904678cc3de6e1e4656b
font_02_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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