Malicious PDF — malware analysis report

Static analysis result for SHA-256 8989dc8157ca9257…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 07:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dd73d7dee2a5a1bb0fc65efe27d42c9 SHA-1: d0cc8ec0d4de3936729ead3ea3b53b9cf161a667 SHA-256: 8989dc8157ca92576943cbcf084a4718b35aedba1d03eeac0b64ea28b6283b2e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. Heuristics indicate a link farm on disposable hosting and compromised CMS uploads, suggesting an attempt to lure users to malicious sites. ClamAV detection as Pdf.Phishing.Trojan further supports a malicious classification.

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://stelmart.ru/userfiles/file/venanavizofudav.pdf In PDF document text
    • https://ecohort.info/userfiles/files/43501671938.pdfIn PDF document text
    • http://bociany.sk/media/file/bimixuxex.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935cd18ecb---gasisomabuvufigudomo.pdfIn PDF document text
    • http://mfcpavpos.ru/file/43218943061.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/kemivezis.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210907090041.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/fedozajulajuvinexusijig.pdfIn PDF document text
    • https://epiphanych.com/images/file/gulevilibagawuten.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/bepofopuzoluju.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396bee4c2a2---59205649270.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/lixejaxusipi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130a49c65724---walodujewomobamopitajopuj.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/19868729857.pdfIn PDF document text
    • http://marketingnews.fr/images/file/zewevi.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/nodajikivonutanawulogad.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/jukerojaputolijaderoxiwa.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/76506032930.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/vigazexugudadevaxobada.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/38763454618.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/67955399113.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/61084082056.pdfIn PDF document text
    • http://mp-journal.com/media/file/pegopubarujevu.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210909_F59431687009F999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=online+video+to+audio+converter+using+urlPDF 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_off0000b30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 10736 bytes
SHA-256: 372b08e9ea9999a0245fedc47bfd0d4acbb0bfa98562e235f94162c1d590e5ed
font_02_sfnt_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 15308 bytes
SHA-256: 1a4ce9fb38b0dce48a793bb13be0092c1f023a063648c6a96f40e68139430d65