Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97531efdca15076…

MALICIOUS

PDF

94.8 KB Created: 2021-07-31 14:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ac0ae56e70db3a774bad5b3bb3ed3459 SHA-1: 72643427ae5b6d4d7406194c43d6ed60100228e1 SHA-256: b97531efdca150767e0701c5b626ceee6772e5562e911fe161bf4706e638f961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cgeminfos.ma/upload/file/waluxebeduxobutegizog.pdf In PDF document text
    • http://rapet.hu/files/zifuvobuloretulibiv.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/34e432012e749b8d8c73f5cfc28e4568/91469558619.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/29627667680.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/livipe.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/29789764693.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/kevusu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/225eb0547192b36b868d958ef6b1b0af/ritisimudazatasova.pdfIn PDF document text
    • https://robertbah.si/files/file/kofuwadumosuvebobufavu.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/bolanofade.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/296844131.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a04d292909d---96301260627.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8067acd04673bfa16532cf21610f66f6/pisasokabinetusanixabum.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/roxurapowen.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/45465520794.pdfIn PDF document text
    • http://yongqingtech.com/d/files/2436246091.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0573bf89abe034c5e5e852fa11d06eef/73668657099.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/nusofene.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/63953316302.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dl1boakoi8nscbf4lhae1rame4/tenovapixut.pdfIn PDF document text
    • http://dhf-china.com/d/files/xolija.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb1cf45a10---jofuvobowefitul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=eobd+facile+crack+serialPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 18264 bytes
SHA-256: 61d9e08fbbb7d0aa1b22b870880a30baf236afca28fd8ad3383f768a1b11d320
font_01_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1B 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off00015495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15495 10480 bytes
SHA-256: 3fbc53cff1313d9fca6079dafe75a4f6c99e44c1879f840fe242226b3e56e108

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