Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b31099d5d8c3c8d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 14:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77eab5de9f3280c6891e0ada6cb9511d SHA-1: 7af60c8a29140f6c18002133db7c53f38b2680d6 SHA-256: 6b31099d5d8c3c8d8a4df568cac8dd6e107ad1d4531baa0980f27f908db25017
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on what appear to be compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://garglob.ru/uplcv?utm_term=visceral+osteopathy+the+peritoneal+organs+pdf PDF link annotation
    • http://curry-box-deluxe.de/userfiles/file/24180796413.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/rurezuvumu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/25ulbqkki2jvcbhq2qmmhaca87/xakolorap.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/rogokonosirawemodawiw.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/23830497272.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/rikopedetawenisodike.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/logajomijijo.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/zawugogovapi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a35695cdb6---28789432846.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/nuvipupib.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/wivafelivexomiporona.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/62620077473.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/gatedaniwemabididotisi.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/rawokawuxusuzivudub.pdfIn PDF document text
    • http://kodemari.info/data/files/xosolasojudifomumakuda.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/vukajuvozubexotiko.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/xuxetibozanejopazujep.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/safuvatet.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/6402065129.pdfIn PDF document text
    • http://sin-hua.org/userfiles/57847122145.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12e690f78---15915602881.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4d2aa810948d3635b4e0756b08129ee1/45401331968.pdfIn PDF document text
    • http://falconltd.pl/cache/file/wivulozugitujozemaj.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_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 17360 bytes
SHA-256: a308d9a50d5f8ce29dfd8fd051cbc121067789e2f850793916b21a80a27a9cb2
font_02_sfnt_off0001310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 10980 bytes
SHA-256: 1bfee6f597a637f33b947040a685bf5f97d30f89734cd7c0085b04de8102f203

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