Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dc553310db1f73…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 07:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfc35de31c0d8d3917c05c67d70d6a7f SHA-1: fec24b0c0479692a2a4ef91a86a4fa566e450723 SHA-256: 16dc553310db1f7349abe21752984dadf969d9b19e0c5c0bca721d6c49815453
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://phunggia.biz/userfiles/file/mubapam.pdf In PDF document text
    • http://tianlanlawyer.com/filespath/files/20210910092250.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/47846168723.pdfIn PDF document text
    • http://15881588.com/ckupload/files/julejubipekexopomepa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614939354df4e---43606677877.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dab9756b6066a8c0106a72f240b810d8/sozikosizivudokapopubofok.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/fufubagifisudeworeriku.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/vofugajavigugifejifet.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/wofunuwejarevekeg.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/valigufukivetemif.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/godevofibebixamaxib.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/fevevigejowulasan.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/44318098843.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/pesobufumubalimosarawob.pdfIn PDF document text
    • http://klpa.net/userData/board/file/soluvilotudatadubu.pdfIn PDF document text
    • https://kvzriu.org/images/file/lijebidi.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/befevitunutalomewa.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/faladezoxakimefepivep.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b17389cc45---37559024198.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/427198ceef141b27896decdd66e055bb/rerokabojupawefi.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifodujugefebisas.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/kidagur.pdfIn PDF document text
    • https://landi-bg.com/images/file/depavowuxelerada.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/kunogunebukolupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dark+matter+michelle+paver+pdfPDF 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_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 16696 bytes
SHA-256: 7fca719eacb2bbba75190161d0fdf03537d5318cebc5ba447a8f469d38d006bd
font_01_sfnt_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 10652 bytes
SHA-256: 66655b08f1c465a7a6b283fa617fe9aef800027350b5641b447066dd6644d00f

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