Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72ac49a8a3b93a0…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 22:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d74b69cef2dee43db16b8a1ba99fb0f8 SHA-1: d9d603c3735fc05a8259f93418d263c7ae6065b6 SHA-256: b72ac49a8a3b93a061ee46c5004e6330d1168cb2d2180a7b2a7fef377bcb96dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to domains identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laros.cz/UserFiles/file/jubirut.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161339a511629c---41445777369.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/fupov.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/solomuxuwekudiwuzinel.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab392ea81---11906695172.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/38561879443.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/77a795e9e9d3512b7506c12b37653189/desasibug.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/88547745118.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/5352476061.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/79250395178.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109071056058325.pdfIn PDF document text
    • http://bienbao.net/uploads/files/90571739985.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/77992210338.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/1005348974.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/74189456209.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/91840503810.pdfIn PDF document text
    • http://guitarenko.fr/img/files/zabuwenukapabiwovuso.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/87132955564.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/gijenixexufirit.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/tidituridopajatowixuse.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/16419370632.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/84075214126.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/51398168231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=golf+ball+position+too+far+forwardPDF 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_off0000d0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D2 17264 bytes
SHA-256: cf0adc24d5a1981b02ae243f29d7557d85d8f382e1d8b857ad518f396d497256
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 10624 bytes
SHA-256: 9eb0790a8573b2ecdb59585172bd3a8a319be8f0fc27a79950e216743acb78d8