Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0648e2b4bf7cf9…

MALICIOUS

PDF

68.8 KB Created: 2021-09-15 12:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a2230897a9495f425f95112120e0564b SHA-1: dea12f325472b1f9d87d3eeed441d2e57aa9a169 SHA-256: 5f0648e2b4bf7cf924e04797909642586900c64910e4f55fdc61453fe4941050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=dbz+fighterz+apk PDF link annotation
    • http://clearspace-design.com/CKEdit/upload/files/40702036476.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/96332295357.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/jodalobawigumizi.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/41982422518.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f4bcb907---796810357.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/iaj7jutdi4o4jc0d2pcnv3d7f4/79313915118.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ebc40267---tubozenilunidawewujav.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/megubexifiwarobezuw.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/72145712313.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210907_70D9985301F7667A.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/butugomovafi.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/tunizojufevavusiriguvuw.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/lumiwod.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/kalax.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/tamulujafegixatizi.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/31565285264.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/zebapujemesekekanajuka.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4828698e---dutebi.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/pedumi.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/mupojarexonek.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ced18c032---91966558161.pdfIn PDF document text
    • http://www.siposferenc.hu/html/14459248680.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91c2138f5---dawefabulane.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_off0000b150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 14748 bytes
SHA-256: 5a224a73a5af7dd549f2a454050691132c4f7fef539d4b7398583f97abd5596d
font_02_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 10492 bytes
SHA-256: adfabe0bd2bcad5c3b1127efcd8aef34b1baea5254e0da4f7041a49dead08586