Malicious PDF — malware analysis report

Static analysis result for SHA-256 805629c5db3d8658…

MALICIOUS

PDF

138.4 KB Created: 2021-09-06 10:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8be7ec9b6661b3fb64fb3d741b618a24 SHA-1: fba8a43147a6aade5594a44c29791469f2e0c584 SHA-256: 805629c5db3d8658cdb6cfe1eeda58e6ab2883db39ae018172e9e3d7348a3f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links and the detection suggest it likely attempts to exploit PDF vulnerabilities or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://andrelandberg.com/userfiles/file/75306872062.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb290a2048---85364645599.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/844rjthh80urqavikav8bc2v6b/namewajuzematuwuxuk.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/mudimerefinukarewesaraz.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/nikifebijakoxese.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d133416ca6a0699b161fe091d626eb95/95394124838.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16075c25ce432c---xebopu.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/matawukawaxasezen.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/81081135595.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/82265382950.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/79466306114.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/67533542966.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/guxirosiwudezivanitoxatup.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0f29750be2b8883fbb8682932ba00def/roxudanuvoxuliwe.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/dimisojoboxiruje.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/18c0620cf754b43f4247dfe9313f6203/17336125772.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61ec0208d---57293463112.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/87097218113.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/96077005104.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/dekitus.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70da821796---govopabileresefox.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090605570314.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160958054d0542---81597002149.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/navegazafinenudezew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ssc+gd+constable+result+2015+merit+list+pdfPDF 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_off0001b6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6F3 11708 bytes
SHA-256: 6905eedd95826f99a57ac2a4c2636988d4c029c21fef1f05faf60fcbfe68a795
font_01_sfnt_off0001d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D283 18008 bytes
SHA-256: 1e43ffe9267e4c22275c905eca18c7b9dda63e338785dec16aa3d170db8e81c9
font_02_sfnt_off000200c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1