Malicious PDF — malware analysis report

Static analysis result for SHA-256 649de104aced8b74…

MALICIOUS

PDF

91.2 KB Created: 2021-08-23 10:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f099b42d2e5767c5dd19b5ef8e4f6689 SHA-1: 18a5418cb096df8e415ae130b6563ad534df4634 SHA-256: 649de104aced8b746dd523d5a48e92ac98e5fcc2f0979455bad91b5bdfd8fb26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=irradiated+food+products PDF link annotation
    • http://rheumatology.institute/upload/content/file/55160357189.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51916474a1---50661253723.pdfIn PDF document text
    • http://poorclarescork.ie/images/47286531087.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dce451ed---nirilaxosusavosuwano.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e783605d61a---kakegelerofej.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/peotm62sotjpa3cgunssepqvk4/fekeweku.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/62548434444.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/latabofosari.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/1291202422.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/fef7384eac95498621f7893fc0047f12/81930315069.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/56673492054.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b1c930ff6c5c679abe55a591fc0e1072/rugifo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vetazebuvawagonuvegejaluv.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c389eeef1bf---vejiponenakorik.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b515e8994d---puwadinokaler.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/nifepelelutonasobexijuku.pdfIn PDF document text
    • https://shopabrang.com/images/files/97986160952.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/62e451d846db1c7ce919e323d99b7cee/lelibagavisuligapig.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202152602524235.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/lafategedufoporoxibok.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16097ca77597a2---kesogufusi.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/bufulebezejovelovomeze.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/92282127349.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d221cb50424---84053053642.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_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 10512 bytes
SHA-256: 2a44610f9016ad74c695f71a7dcbea2aff81244c399c2ed116d7aea2ca18786e
font_01_sfnt_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 17556 bytes
SHA-256: 7f35a0409d57c7af282bc695761a10288d4f38264f5e3aba060b1cab43ddde30
font_02_sfnt_off000144cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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