Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5ff3c2ca546532…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 02:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1cf21d8d21e807d0e66bdc1871430476 SHA-1: 5b9e9f9176e41a14bbdae225194fb219d6977a34 SHA-256: 5c5ff3c2ca546532e7cf2d2d294da77c4de251c63486dd793cd762d9b6073c1c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cuatro-pr.org/sites/default/files/file/tademosubisarevamewigej.pdf In PDF document text
    • http://www.tamtrebinhminh.com/public/files/zuxutikoxuzoj.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ba603e5ec10---jefemu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/62085153161.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0797d03ad---telubulumifodo.pdfIn PDF document text
    • http://maksimetall.ru/files/favodakijagalevolipeloz.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b8287f611---pakekitulogug.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608156b108e14---60128345748.pdfIn PDF document text
    • https://people11people.gr/uploads/File/5801693624.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f8709f59ac44bcda9c3f1643a1908bcb/popevasinajafuxipafosuki.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c347d437a36---64041126304.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7a99a37c536c46ac2af63931d1634763/batizulefevijesujovufes.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5hn9nfsjhmgp8lcfek8mf2l6sc/dovepododasuxefegepibarij.pdfIn PDF document text
    • http://vaithun.net/upload/files/43022797089.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/vaxeso.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8842f13d488927160875e73003364176/51988801321.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/34220087279.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/renisododupo.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/vulekogugelavelugad.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39c788b78---puwolatofegaga.pdfIn PDF document text
    • https://bataretak.com/img/files/file/75526063509.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/13276959675.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/18092544113.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cedd0f5c---79369326333.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/33716110218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=2015+chrysler+town+and+country+repair+manualPDF 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_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 11408 bytes
SHA-256: e7aacb3a7559e3ff2176d628f4e193cb47f6841d338f907f3cada8fd3f3b3a76
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 17708 bytes
SHA-256: 6ac6a94a532476c23b62dfac0c5d2ba798cb22f24b125e39f6602591c87255ac
font_02_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1