Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2647b862a98c16…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 14:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a15f1f3b692b41a8e5cec918d15e68fb SHA-1: e0f57b55434298aa0d16f3824da1865b06eba730 SHA-256: fe2647b862a98c16e3b6b968340c35c104f3457db43539294f4d3c00c96d1222
156 Risk Score

Malware Insights

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

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 pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of numerous URLs, many hosted on potentially compromised or disposable domains, reinforces the attack pattern of luring users to download files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://forumhrdbekasi.com/webroot/userfiles/files/guzavelasutefigij.pdf In PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/73389952565.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/91805807128.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/87586153635.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/41942584289.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/29713118184.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wixorinapovofej.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff31704bf---batob.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/sonafudofobasemefoguf.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/58624924083.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/41571519132.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091514141732945.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zadof.pdfIn PDF document text
    • http://favourtec.com/attachment/file/36488314111.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/kusopoli.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/54af4eccfbe146037598218517289197/91990103122.pdfIn PDF document text
    • http://stisk.com/file/16481387508.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9d712500---32426404224.pdfIn PDF document text
    • http://rsst77.ru/upload/files/48693285673.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/zazetefixodemi.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/bumukugerudasumex.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nagugupugevoxetodufu.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/jajagixiruwivaxeni.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/komipibimumuzedate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pubg+mobile+obb+file+download+2020PDF 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_off0000cf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF98 10900 bytes
SHA-256: 99ea013cbede93374b30c6ba05876feb0c97ba85f065cc99e545aa26d8bc1da6
font_01_sfnt_off0000e89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 18608 bytes
SHA-256: c6fca2288c51977c57e132223f197b57dde0df925363f47858d21f9e2c7b68bc
font_02_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1