Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb7ba8efed49db5…

MALICIOUS

PDF

81.6 KB Created: 2021-08-08 12:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9ae96d6e2e1bb7d5c6948f394b0e70f SHA-1: c546b850bfd9a5471e4fa5461214139f9340d125 SHA-256: 6fb7ba8efed49db5322cf3ed5dae043fe6bf85998caa8bb6ec76811b7ad3a662
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. The presence of external URIs and a link farm on disposable hosting strongly suggests the document's primary purpose is to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=olivier+blanchard+macroeconomics+pdf+free PDF link annotation
    • http://mobilni-kadernictvi.cz/files/file/rigeliguvotakalarer.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/zunumulukinopulofune.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/41994785864.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/bemeto.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e22877c3e---masijudubudaradosozovalux.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080735245650---92505323588.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/05edb163f826f27d2ec351054c9e24a4/vajabobefafawotofe.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c87aa76618d---27810764204.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/jamabiwovanubexus.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/kupubapofawanulekakew.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ece6704b5f0---limimusobipet.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/12253589059.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9117b0489a---41567215951.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/meselaz.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f26e695b2d8c44fda4bf454561d6fdbf/fujafusewabagofinenusu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/t2plpuun21oe67eaumcq5f5ptc/nezubemezunorofar.pdfIn PDF document text
    • http://malachowiacy.pl/files/file/23108220949.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/54688658856.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/1501608950.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fd87ba923fe786ab4632b238fe382339/25964221683.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/5567998200.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/pimewinivurabesuwive.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd8f8ab08---55731214792.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/46222163183.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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 17460 bytes
SHA-256: b55e552fd7e8b56e005a2d52ea6be81912024050da673d0ee779fd96739aa223
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 11016 bytes
SHA-256: f3204cfddb2350e0daee1fa331243e42dc5600d27342701f94766bcaf54d8b28

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