Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf0452b3c9c2f83…

MALICIOUS

PDF

93.3 KB Created: 2021-07-05 02:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d4a63f1146451fdfe565197485ed58b SHA-1: b4bdf1c1b8ddb994960f4d438729a8b69d213a98 SHA-256: 3bf0452b3c9c2f835142704384b8a9289f001b112b06f14f7274421e2108035c
196 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates a common tactic where users are prompted for a password to decrypt an archive, often used to bypass gateway scanning. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0d79c7f5b67f6eb3f0f5236928da8b59/jekubalerevibebuliwoku.pdf In PDF document text
    • https://actorconseil.com/files/file/vujiregu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd090d445---faxivumadarevubuja.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/achkm15sna3u5k79gg1jhi5nb5/79524355746.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afb79ad9c03---53168875925.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/260feb84cda07ed7988e2459ddf8e19c/dogefasaki.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/78508668870.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lotajodusogeb.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/gavezanepesusijovesumeruw.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/bofixov.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/46273887796.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c390b14481f---roleno.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607752c5e6f5a---bufanopuzenofutipipume.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/xowiwunimo.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/bamibaliwikut.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/xufotup.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pr1qpg404aefl5q7gnomhidug6/35456008534.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/noruv.pdfIn PDF document text
    • http://rld-carbon.ru/file/49468526673.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/30702253085.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/c853ff040369d8f2d7346f6cb1cb0c92/52819062499.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ect0917vp53rrnf7lajodc0ak4/82252992902.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/81367352476.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/49717297913.pdfIn PDF document text
    • https://www.truemark.dev/DevelopersIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fresher+interview+questions+and+answers+in+javaPDF 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_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 10804 bytes
SHA-256: 9ed47b411da0edc16303d8015859451d4632382241e244939d73f159e9be0f84
font_02_sfnt_off00013697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13697 18340 bytes
SHA-256: 540f67db0503d1748bf8e31ec33bb63230b74f534b37418e71880040db97ece9