Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6997f106e2eba5…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 13:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6269de8649614f1741fdee666ecf114c SHA-1: e53d96310f92cb2ae322aff558aa931c66b37afd SHA-256: dd6997f106e2eba54687d1a76b216976396cd221b4d658dec0b2050923c26cb2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=pokemon+heart+gold+emulator+cheats PDF link annotation
    • http://mygiftltd.com/userfiles/file/fobet.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/11036780958.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/94404621128.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/dofuwazepemezi.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/81318029980.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56355171448.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/14320940878.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/76287340298.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/88737898276.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/lurojit.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/8992721388.pdfIn PDF document text
    • https://duel.pl/userfiles/file/25044755451.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139ddc6e0184---vibiranujoliwefazuxuw.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f534b4930f9c7ba9852571c1179a638d/valiruzesazakutimivikop.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/wifog.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f18badc5d0364096009ef047db8f6a9a/tadibakiwope.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/sogesedurapiwexuluru.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161357eba2f7d2---parafivukosepulalekatubi.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/woloxe.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/65955378564.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/lalezuvozukamanot.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/mujibetubaduw.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/59981371567.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/18sj63ka2kfailkrdo7cqj0lk2/bubaxowelelopupelapovobod.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/gitowasa.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_off0000c7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D7 19024 bytes
SHA-256: 43f54f6bfd2b0b53cd34d0170c142933e9bdd82665a9f8bb4f9ba321f6090aef
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 10920 bytes
SHA-256: 5b92e88c0da78ca0c35bd27cd8b0f62c95573ef7f50f6c2d72fd58f2739d49d6