Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ee9419d50aeef2…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 10:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9be6956539b5bb127a2acf476bcbcc98 SHA-1: d376d22bf27acdaf6a6352bc6325bf95a06560d7 SHA-256: 86ee9419d50aeef23fb99edfaf03bc03d14f84f51e5fce14f71a1cb557fa14d7
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a phishing trojan. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, while some are marked benign, point to compromised CMS upload directories and disposable hosting, suggesting a distribution mechanism for malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/hq1d4is2id7k2su6fkd2f6q1gs/81665628878.pdf In PDF document text
    • https://pleasanton.com/wysiwygfiles/file/zurapig.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/35523521631.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/zimenixez.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161494352813b7---3482868634.pdfIn PDF document text
    • http://schokobrunnen.com/idata/xudevelidamip.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/tukumutiviv.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/55359251615.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/83597085643.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/33341460016.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdbee59e0f---janakit.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zifaserodovixujuxe.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/budaxetusupa.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614057606aeae---91045067576.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/22489146017.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b6494608c517720b4137fba80fbcdeaa/ximumesatewenukolatabi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zotezibibu.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/82108233544.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/19608906159.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/64851378153.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/93257460421.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/sonajuwuxikifujinejuniv.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613035611914a---fuvatelifawazepega.pdfIn PDF document text
    • https://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/161501300d975a---13650118852.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/juvewomafimaminatoteg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=today%27s+horseracing+cardsPDF 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_off0000b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 10616 bytes
SHA-256: 204029f6378b360d6f7a6384021e45ed2568d7a4293e53d234d341efcaf3d062
font_02_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 15688 bytes
SHA-256: c85ff796cfdef204e68a3958d0400a7bd8c06470fa5beb9152de2a49c434c693