Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b64d02b5407654…

MALICIOUS

PDF

108.8 KB Created: 2021-08-16 15:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a018d247b1c41f1051ad03783c73271 SHA-1: c463fcfc29f0ee87ba647de76927ee25da86dc8f SHA-256: 11b64d02b5407654df1723449222a13badc8f77805accce903866596c2670671
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's part of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qls375hj6obbi8b4api43ujpob/14427962608.pdf In PDF document text
    • https://aashianarealty.com/file/64186405632.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/85219752744.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/xenuzerijubosakaz.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/52985424243.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/42997574833.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/22663240201.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/lefofejog.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cb44f61765f3e88005947963f86bb750/39169337818.pdfIn PDF document text
    • http://airmon.hu/images/files/16052833332.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c7345c80a55---tilavefigoxolutuwoxip.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813cbde8af4---vevajavuve.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210518024450_0x3d1m.pdfIn PDF document text
    • http://bdn10.cz/files/file/sixajuleneba.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5iur13t5q9gemr18nboj50fgss/65831854872.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d88b4c742c---36027034036.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee184f439---kalemedudisusufidawekufe.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/b487a1ac85170b3fa7b24924c8c927e3/33116416897.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/80300313856.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b074b22c629---rezusegajit.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/18803708466.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3d720bff74a50d89f3fd7e4539491812/xular.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee455e712a1---71944852296.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16093d04f44452---votod.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f94ec501aed3554dfbcd73c6eb5240dd/kobow.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119e4919aee2---87477528975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=new+tamil+movies+download+2020+tamilrockers+hdPDF 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_off000142ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AE 11096 bytes
SHA-256: 1ea70968a531e0e3fdebe9cf1770fa8410075476f618376ae7e46e92a4ff5454
font_01_sfnt_off00015c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17492 18116 bytes
SHA-256: df90eaadcdbe96ec55d734e90be18ab0affb480a90d7ea1f30d5f183abbdedda

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