Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4fcdc0bf7a9817…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 01:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab18c1a0b584b28f65a8df0735e0a243 SHA-1: 7ccabef957c98217ec56e87d5a1d10e541b4d060 SHA-256: 5e4fcdc0bf7a9817f353a49235f600ebf75cbfcac26983032a2fa5cbb96c7a9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to potentially harmful sites.

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://inwebjor.ru/uplcv?utm_term=3d+porn+games+on+android PDF link annotation
    • https://iwistw.com/upload/files/42914138798.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210902_29eed.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/62208569666.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/soxofiletivinujuxeleduj.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/33597235566.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/51743100122.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/nulofisejorodi.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/gitenopumizisikop.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/xasin.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/fozujokasobak.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/kejik.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/tejanafel.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/89864551395.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/9705587003.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/30609335385.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/57637586037.pdfIn PDF document text
    • https://plasy.com/uploads/file/patozo.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/wefimemenud.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/muwuvivi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137a68e3d8dd---vilopuxerad.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614596ba57cf1---87372178818.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/tamelipus.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa59d818d---buwakaperutofozoxak.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_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 10668 bytes
SHA-256: 8cf9ecc4bfb5bd7056cca7af49a0160becbd0d0265561a4f8885bd56cfe4d182
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 17264 bytes
SHA-256: 72e11b6d1e43f535ea98c7e8265b168ae620765151e55d1bc90de941a5248d3e