Malicious PDF — malware analysis report

Static analysis result for SHA-256 751ee3c5683deba7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 01:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 454a65ba038838e96c16be3f597248b9 SHA-1: cb073487bf7479c6115653cea19f0a1549c408c8 SHA-256: 751ee3c5683deba762d8e277848435a911c4775805b7a8baa86272067800f60c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://mirai-kankyo.com/userfiles/files/30337778205.pdf In PDF document text
    • https://bellcera.60km.com/upload/files/32720978229.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d72ce0ba3b79369775d62f7b16932e87/wojusixizegenobidasur.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/rixobepaki.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1a486530e---62217999671.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/43037704417.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/54586829597.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/wesinukidojawulezile.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/dezowelolekajo.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/pojumemejokezusugakoxenos.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/nazeririlobegopodipo.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/47602285003.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/foroxezivojapax.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/dagab.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/95233416400.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140822139720---vupanunibimeduvijar.pdfIn PDF document text
    • http://leruichem.com/upload/files/58900216231.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109091357536875.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/31101220998.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/33032579737.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/48750628384.pdfIn PDF document text
    • http://cartopack.be/Images/file/birafifemusiso.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091805112629776.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/gariwimotumuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=samsung+s20+camera+apk+downloadPDF 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_off0000d596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 11264 bytes
SHA-256: 6d1f161e627815fc3876a0c8d64c4e1c30a27e203e7140d0c531d5d73def9fca
font_01_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 18532 bytes
SHA-256: 98b3ca0d32ec70038b44b2d9fff03be8311ac1236608df1b8ce1f981355e2226
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.