Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db17aeb8f8041cb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 07:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1157b86242c7174ca2945778ef727b71 SHA-1: 7e79d1d49ce7b82d8fafbd898ba2012e4c092aae SHA-256: 7db17aeb8f8041cb048f0d60f59bd5b3e7ea3fdac60785653bd436fcbb0cc782
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it's part of a link farm strategy. No scripts were extracted, but the sheer volume and nature of the URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=document+to+pdf+converter+free+download+software PDF link annotation
    • http://adas-muko.pl/photo/file/60560494160.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ufnirv3ootqe297hmabfc3lil6/jisabevekafafojaj.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d885a04f49---36041326556.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/32723033583.pdfIn PDF document text
    • https://tisuputih.com/contents//files/86854430897.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/20025503523.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f199b2afc7---97441261965.pdfIn PDF document text
    • http://59irc.com/admin/fckeditor_upfiles/file/2021081920575680554.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/waval.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20eca5d08---murererif.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/26999114095.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/kawuguxebekives.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/30314968294.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160843a4051191---dewofovulatuwevidazisewow.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a22a748da---welaganigivajegoregetona.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/91964442649.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f86303da6---46876825322.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/15782085301.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/mutebejapu.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/zojipomo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aee6dd461---tugavifuwevilafutinoduja.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///riripi.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f851ae78966349cd4ecacd589f453e7d/vutibefinusobusuvufivore.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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 20332 bytes
SHA-256: 5f903a04024c4bf68bcc7e5e7a89d5618440da535e7345997ad82e486961b12e
font_01_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 10940 bytes
SHA-256: 9da39c1c932cd1868534514cde4b1270d257dd1738d9a7b794562c33728adca3
font_02_sfnt_off0001246b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.