Malicious PDF — malware analysis report

Static analysis result for SHA-256 25002e8b3e422984…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 05:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f8c6891744f248f2318aae41f1cce107 SHA-1: 47b9780ad9a35a54cf8d8eeef600a6d830227c77 SHA-256: 25002e8b3e422984f1e5a62a9082ae7f47b6585acd063d903abc9d3e17b4686a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=making+connections+3rd+edition+pdf PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477a8dad022---xotige.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/guwazivoveludaf.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/bidibegolejevesibagu.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/xuvedavapifunumov.pdfIn PDF document text
    • https://izr.fr/files/zepirapanonufokutefifi.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/dawotilo.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/zaferugisumujozefev.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/79o5gcvhemmunpq8t4fnt2ll10/naxiwotedupirumivopek.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/88859675952.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/37490755405.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/fobilatezigadadigefopugu.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/gezigofarubizatopajaxi.pdfIn PDF document text
    • http://santehnika34.ru/images/file/lumirasogolafakij.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/matikunak.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/nememibopobexube.pdfIn PDF document text
    • http://fourfoods.com/images/files/virurobifidatod.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133520cdbd77---66522082632.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/xupak.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/repijowejezejuwoku.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/98562076651.pdfIn PDF document text
    • http://sin-hua.org/userfiles/30212254755.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/binifepenovutovufato.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/15480523228.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_off0000b86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 11008 bytes
SHA-256: 8d0aec0a4c8d044f83ca32ea1e8da2cc3ffce63d97b087fa89323d2cef0c9272
font_02_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 17228 bytes
SHA-256: 25c79ba1e0d1882d76bc40e4f951e77e01b0d09b147a041bfca4b9087d5659d5