Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e44be0f2a0b1f05…

MALICIOUS

PDF

67.6 KB Created: 2021-09-29 14:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6c5835dfa41e060ef8cfb153f647387 SHA-1: 0a7b05e7395399c437e1cf2da342c2c623ca7238 SHA-256: 1e44be0f2a0b1f05efd15241334859260ac9ce2f70582dcdb9ba60c0aa68799a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Numerous embedded URLs point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=metode+six+sigma+pdf PDF link annotation
    • https://bbu.vn/Images_upload/files/39972846387.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210918145816.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/30712490650.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/59761787597.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/u171if90d2fok23i52gh4gd3rr/povoba.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a94889cf7---wiwote.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091713483999.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/tosunosuregu.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/kugomukunun.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/pemise.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/kumox.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/wemudizanudose.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/furakuzaxigemutevazutu.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/fafadabokikewoziresuso.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/3o5iomg4noouobbn52o9q7ngd0/21537694000.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/rezoruxidujoresizor.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/22529208954.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/16891026887.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/26200830448.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/92632875661.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/rumomedafezusejidimo.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_off0000ab72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC384 15188 bytes
SHA-256: dcec1a684a964f39388325bb7b3b3c30b11c5cd43f79eadc61ab5d6186219cde
font_02_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10684 bytes
SHA-256: 6e2555748b1e240124d7ee5e2f64091b139b96e4a761b6fb4c9d51e968ade07c