Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d86e27fc09600e…

MALICIOUS

PDF

93.9 KB Created: 2021-07-17 06:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10a38e7fe5d4234335d3455c61074705 SHA-1: 36d5832b9f2aba4abd45c2325d5d59e8c747ba5d SHA-256: 67d86e27fc09600eae198eac9e444b0dbf03d9240d07841781fa0be2c31e6407
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many distinct hosts and URLs, some pointing to compromised CMS upload storage. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://orgue-chantepie.info/FCKeditor/upload/file/33766559459.pdf In PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/vaditezojanonoj.pdfIn PDF document text
    • http://mousike.it/img_ins/files/77663798038.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba77589e7---37978584301.pdfIn PDF document text
    • http://metallpress.info/files/pafilenav.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2a963a81a---3501757545.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ju7ldjit26eb50d0pjm61cgc7/tesobirisegolamate.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/odum6q0269j0r2b3f0tir90786/jiwejikikunuw.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfbfc5e672---39892499774.pdfIn PDF document text
    • https://assistenza-termica.it/file/51526447294.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/konumopunopelazusewu.pdfIn PDF document text
    • https://12shio2.com/contents//files/16416608033.pdfIn PDF document text
    • http://kasargod.net/uploads/file/76116485534.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75d08e0fa3---zamibexaminopetodijaradet.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7612da80a---79444744446.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3c80a8b4af582c203c5a873c8e53a48b/jazedigituwalemuro.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e13cab824---weteli.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/zemilifomukivomeno.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86ca1b3c18---tavuw.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/46a5ecaec5e2d0275933e191b25466cc/winatarisob.pdfIn PDF document text
    • http://tai-group.com/upload/files/20108601702.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eb6cd510e---71010215238.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/xudezakeve.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/raxamezovujurexafazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=physical+exam+form+for+schoolPDF 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_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 10616 bytes
SHA-256: a18fefd9084676cf6a52c4762382a3c289f338e50ac2b70f01a99f8fced2b10c
font_02_sfnt_off00013e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E51 16944 bytes
SHA-256: 9dc6c420f37c19ddfa5051ef1d2f13c17de54ace7a8b3b33db06edf608aecb4e