Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df6ecd34589a69c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 13:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0adabe30d7a80e7ce55e322c3f277797 SHA-1: 0634101a1029ed3d9a983b21ea58776806053610 SHA-256: 4df6ecd34589a69cc1ba1b8a10431c4d073155a4d81d7ceedd863d025d5a6796
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to this type of attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/32323161359.pdf In PDF document text
    • http://madmojo.com/fckupload/file/70113105456.pdfIn PDF document text
    • http://adice-area.com/pictures/files/19718696703.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/493c6rrvbndau3up5scubac7m3/nogavedixuzug.pdfIn PDF document text
    • http://usateatop.com/_upload/files/11003421290.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/90990684101.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/1850724762.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/22271762824.pdfIn PDF document text
    • https://palet-school.com/files/files/74122533077.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/odivaragogukekamewoliz.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3fd1a818---80634154542.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/89823946760.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/tirafetaba.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/beraturarumegeg.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/togutapojujazoxewogol.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/kinarinamefuvagofo.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/zaxaxufulomo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a2f0c99a---kimosategifowukebobosebo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/70664878645.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/eddb3565d05c27700a1c095b9d254a2b/salawexebevuvajofi.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/13750891920.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/76379052339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+empty+phone+storagePDF 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_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 10752 bytes
SHA-256: 5ab0cdd554876f1e87a4e5a7ea53b910fb83e767599914b9d9e305dc2237dddc
font_02_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 17500 bytes
SHA-256: e01b78f4b6bb39d5cc938270dddba421a334f6845b24825576ff3af98ff4a68f