Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7dcda1be651f215…

MALICIOUS

PDF

87.7 KB Created: 2021-09-17 01:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d1f697fee3699539d16e1d8b52a8290 SHA-1: b541ff7737074005cd2b200653e2c29324a65308 SHA-256: d7dcda1be651f215f69b63c740ba029b916560e8e89c544409314b40fb333f12
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=loc+kargil+full+movie+hd+1080p+khatrimaza PDF link annotation
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614078540d1d1---xezuzasumimejunuvavex.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/49247312260.pdfIn PDF document text
    • http://elitvorota.ru/f/file/topamebetul.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ugbcacfv2f1ipuead0vrabv1u/13620019805.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/54255138170.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210911020017.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/10535921277.pdfIn PDF document text
    • http://unityproductions.com/upload/files/41632615861.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/zidilivujebedajuwo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6bda5f6da---40110841462.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/bipuporuwomoxakaxokul.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/ziloxizonug.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/82311976739.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/85753830578.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/88632303433.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/wezuf.pdfIn PDF document text
    • https://ags-car.com/upload/files/7890751100.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nibujebagexamom.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210903_60DC008B495D4470.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/nuxolowelebetokeweso.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130909697617---juwaz.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/muzuxinelif.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 18588 bytes
SHA-256: 67f2a570cd66288f74931ff730718473e61d6681bc186f4046df21d6f8454b06
font_01_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13663 11452 bytes
SHA-256: 005d82de5259e1a42e313b893d638c7cd90be5a0bd3369b98cd45e71cb6b3694

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