Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfd3cb523cebeb2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 03:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1361a8c871e5a7650e57625a08b450b1 SHA-1: 571a254d541565c6210fbfd59ad63425dc90d082 SHA-256: 4cfd3cb523cebeb2682f05626800f59c3c8cae0449b7429050219472fad6981c
196 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a remote-support tool lure and a ML classifier indicating maliciousness. It contains numerous links to potentially compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or phishing pages. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://xaydungphongphu.com/uploads/files/jizexedazu.pdf In PDF document text
    • https://sambelteri.com/contents/files/15787824479.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/90175713250.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/vativovi.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/54643334169.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/52458767439.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/lajurisevulukiwusadapu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tk4ke9fi6ocv51h4093v3r1vcd/rofunedewojelululobi.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/pinagusofubifavexunem.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/fadilijekaruwe.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/bezixofijexovawe.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f8ba1f075a270d8bbed38da0f391487c/37433290501.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/20012575874.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/54909986830.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/romoxavigivugizexage.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/15415097490.pdfIn PDF document text
    • http://vuason.vn/upload/files/53845507707.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/bovanorulasem.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e012c2a2---15696038880.pdfIn PDF document text
    • http://imi.vc/upload/files/19164677152.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/74965100271.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/65875236579.pdfIn PDF document text
    • http://fruitvita.com/files/files/17979503889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=use+android+tablet+as+drawing+pad+for+computerPDF 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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 11296 bytes
SHA-256: cc2929650cff96c1301d78b3a790137328c4a0c539d18715db324fdc4382b5c5
font_02_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 18620 bytes
SHA-256: 0ceac4539ceded99ef7be6047eb6c1d8abe75087f44fd64c661fb90c82cdd16d

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