Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ee5cff2b273a13…

MALICIOUS

PDF

92.0 KB Created: 2021-09-12 21:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d4fd7c56ad4cf73ba30e1e35f550754 SHA-1: e251bfa461bd6c335172b3dcd3c20d94b96fc2da SHA-256: 36ee5cff2b273a1374506af1da56017c449ce08a1d4a4991448b167fd369e5ca
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest a lure to download further content or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://nomylo.ru/uplcv?utm_term=pokemon+delta+emerald+3ds+rom PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf68362ed---bapijapuk.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c53a839db058281cb06c5d8a04c7bdf1/zomuxelejavo.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/tonijofived.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/44857849871.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/gaxofovo.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/zigevopezevabosibuv.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bd0fbcb730f88058a00fcf5dba6e903c/zapelufovozegiravad.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/70821569869.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/73677571763.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/27456226644.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/27198500519.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210908010849.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/dipinewedebinobopikilotu.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/90239356195.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/73888473950.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/zopupafewamev.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/zezumozogibifetatuxusuku.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/33493782992.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300c141b5bd---gitijabu.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/retowupinup.pdfIn PDF document text
    • http://budka39.ru/files/51931882248.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137577287b9e---94314727907.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/98387276347.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161363b260a00e---wepinugogunuz.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/62693334058.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/rulepubunelubanadif.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/ruvow.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_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 10580 bytes
SHA-256: bec734506e97ba4961cf42b806d47c5e57d783304d9d4648f0f8b687bd3c628a
font_01_sfnt_off000115a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 19868 bytes
SHA-256: 5f4dc5ba7a3973cbfc2c52a7ae06493c9b8e5cc68f8af55fffb0b4796f83f8bb