Malicious PDF — malware analysis report

Static analysis result for SHA-256 af527fbecb217ff3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-23 11:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc7fcaf20e1b0081eebe0dd463e175b1 SHA-1: 57f47b1bc7ba208548db2db635320cbb78b805a1 SHA-256: af527fbecb217ff3c4c0d7ba17e2aabbf713a0d847e60d813065dc7ebce022ae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://aesg2edcv.handylover.com/upload/files/kivuj.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bcbf5bb99---73390855477.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/ziwuxejetin.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ffe3a1052---xaweginudusaj.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/karuli.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210921_98F0A4B9C71FD2BF.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/97270766241.pdfIn PDF document text
    • https://atlantidegattico.it/file/furexot.pdfIn PDF document text
    • http://anm-av.de/uploads/files/ximotojikixazoveda.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/78515363362.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d29d838c26---maserudurogapaj.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140edd2d831e---zazolonufituwagipatavugal.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913081710410720.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/bupesab.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/bujobugibatezepivaj.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/75209445702.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/kogubepibuwunonobekodik.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/xifixuxekijaxage.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/wexawopodexe.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/binuvepaga.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e3f64748---ferato.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/96673872259.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/xakalirugobavobufos.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/48014377424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+scan+qr+code+apkPDF 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_off0000d1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D7 17648 bytes
SHA-256: 5fb77786ec8843d3ba93cf5761dfcee0251c8a5576fa7f5376037c61ece87834
font_01_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 10644 bytes
SHA-256: 1d8d01cd18ace3d6d298dff5d3fc627ba07874848618670b7240f3903d2db12f
font_02_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1