Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bd01540b2aafea…

MALICIOUS

PDF

164.0 KB Created: 2021-08-18 11:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7a992e4aa7edf545e629b09cdf249790 SHA-1: 5b04c59da0f36cba55169cbe901dcce25d544058 SHA-256: c2bd01540b2aafeab4a7e1aed5a925f1b1ca6b80da775b4c6c889803b586b7d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mihalex.by/files/files/7175587180.pdf In PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/62958014436.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/84204655380.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///wejosepojetemude.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6b5d78e4f---74634514732.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/22/43028087509.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/wuretefudag.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/jadowosipavepozaju.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/99903739168.pdfIn PDF document text
    • http://fitviewer.biz/files/file/zazov.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/wirebidomi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077746d07e3e---22137774761.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210725004628_1428237183.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84d034c7a---keraledamebivu.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/94070382661.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/28794924839.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e687441d7da5bfa43bfb90d503adaea/mabuvedavubulikesadid.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/dovudorunilobobulabi.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/17348229831.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/17641341731.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/1417841096.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbb9564f677bf979ed04d7b86e61a1b5/1374307966.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610665cdb5cc1---mirobipidilixiz.pdfIn PDF document text
    • http://jucal.es/images/file/83133964823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=vhl+descubre+2+leccion+1+answersPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000202b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202B2 4920 bytes
SHA-256: 1bf7fc51b7a3c4a0d9d089f5a5133b0f61a21f337552752e221ffb1886a634ba
font_02_sfnt_off000214b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214B0 10836 bytes
SHA-256: 366b77b98b2a52a8db684c68cb0750b69061a1ac10d2bd832b31ffd0dc8956cd
font_03_sfnt_off00022db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DB5 21196 bytes
SHA-256: e10040cdd158f324a5c0faaa9b385ccde627e38e07769abd4807c068ac056a39
font_04_sfnt_off0002641f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2641F 18488 bytes
SHA-256: bdaff60779dd2242afe84191fb4d264611bf5c23678966c2e25cc3837465dd7e

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