Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df79f092fdb9d2b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 13:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 95d9b79d7e82cd9e21368903f729687e SHA-1: 5dac1e3a28f925ea84fd3a3d06e83697c536382e SHA-256: 8df79f092fdb9d2bd6fd181d2a78d4177b3ab8e762dd086e4471293ff721e94b
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. Heuristics identified it as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage or appear to be disposable. The primary function seems to be directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aeon-dev.com/uploads/files/202109051330452333.pdf In PDF document text
    • https://hung168.tw/UserFiles/files/22797819013.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/85363936703.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/60118610112.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e58a7d6ca7292d4d16b5b3260df87912/58706523628.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/43848828372.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/jizexugunuxilofepev.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16304758271279417454.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/41825635348.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/77348133778.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/wixunaxizawitepuruvuxa.pdfIn PDF document text
    • https://pcetravel.com/files/file/47401332860.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/29825462249.pdfIn PDF document text
    • https://tekartltd.com/upload/files/pexoselotowemigizovowegi.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2419cd188---lowogonusisaxefixebekuz.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/31476239238.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/xubokabelafebaz.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b664f345---pikosaziwujupezokosalo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e236d518f6---novuwigoxaxekunogewu.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/91785931486.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/68083986057.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/varamapudodivuw.pdfIn PDF document text
    • http://cjatkinson.com/userimages/94408129085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mp4+download+app+for+androidPDF 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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 21260 bytes
SHA-256: 45a9362982008f277159fa9989d234b1bd4332e3f102cf97013f2a577b096862
font_01_sfnt_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B5 10252 bytes
SHA-256: c0d73cbdd19af1f01a4f311a551604680f78e187666f4df8f394757b5fe5a68c