Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b44a74fdb638195…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 00:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae558b87f2c044fe5297f27fac46fff0 SHA-1: acca464b0bf5b1ea8f87709124d0571d1a7c9d8c SHA-256: 8b44a74fdb638195956f14d76d79fb8361421b17cda2d384e1259b426f98298c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure strongly suggest it's a phishing or malware distribution lure, likely using JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=jet+audio+player+pro+apk PDF link annotation
    • http://likebarcode.com/image/files/20210902_063433.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/13910347674.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/nejodegosavanifadomago.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/84498388367.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/pururovimodulovewe.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210918183237.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16146584ae7e75---tofejajerexupoti.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109031810446729.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/90062391295.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/20d08a40e45b050a2c2adb75b5a9aad0/74500228251.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613067ea9dabd---93716971468.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/jazememogasobelefazisowub.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3480d7eba6c94a1ef3133530070e4c10/75011411062.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/kugiviredate.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/57183059501.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/1875385902.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/68701482897.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/duritolujis.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/90247348994.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/29956538035.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/sabupumovuru.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/xaxenomezerulesisiditil.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/putavajedesatodonil.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/kokodib.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/litade.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_off0000bca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA2 10408 bytes
SHA-256: e402e9c3bd73b70452acbaceb19d399ec47ef73e8ca8ca97e2801e47ff3fc455
font_01_sfnt_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 17264 bytes
SHA-256: eb34f7049e45e318b470afde4b1932046e993c04b1558cd21d6b22385cd0a69c
font_02_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1