Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e42d29a1a4dd6e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 14:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a785f2492f3d1a6ef1d52af3f64497ec SHA-1: 5b5668daa1fe38c7c5c7b926157e6a73ee128f94 SHA-256: c7e42d29a1a4dd6ed6b2744fdf5eadad4c761561b4dd71f67d25d9eadea5110c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://philabc.ru/uplcv?utm_term=she%27s+the+man+full+movie+123movies PDF link annotation
    • https://viettincapital.vn/upload/files/milasiziwudaral.pdfIn PDF document text
    • http://minerva-collection.net/files/files/pidatiposapujepa.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210923_172508.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/nadalakan.pdfIn PDF document text
    • http://webursitet.org/Files/file/35655249399.pdfIn PDF document text
    • https://plasy.com/uploads/file/kodoreravogugazeb.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/dexogozilevuvimaxexisobu.pdfIn PDF document text
    • http://e-hematologica.com/users/file/wepidoxefimikaziwape.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/savinejugubujamorojugiv.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/8888416183.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/bovife.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/40705486721.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614949de9113f---72681318043.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/85952645421.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/30010810823.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/bowefizutamidev.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/48459184022.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/wivujomeno.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/regetirof.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da8d48068d---kusewikogataxagavikak.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/vupabidop.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613543c90e012---vevogagamizimogofisosevob.pdfIn PDF document text
    • https://pcetravel.com/files/file/34562688097.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/77291456139.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210904023734.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/58610446516.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_off0000b1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B6 14972 bytes
SHA-256: 1444c68b09d77c4cfbd94e3afd318cc2c782ed2a345f638ea07be24bd6252a06
font_01_sfnt_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 11000 bytes
SHA-256: dd8a76d97e830296072d30050fd711e8bfee05d03743e22fc2951abf6239e65e

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