Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e2fcf60170b3d3…

MALICIOUS

PDF

81.7 KB Created: 2021-10-06 04:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 16bcc427feb0f301f21e513034e12930 SHA-1: 08e336e105b05dc24a533432d8098648e5f45936 SHA-256: 21e2fcf60170b3d393ed963f416209a4856b6510f194a763aa2875f28b58d804
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the file as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143caee733cc---17688736192.pdf In PDF document text
    • http://www.darvidproperty.com/news/file/2970813304.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/4577134910.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/04fe012ea072b425bac5ac0ec68f6587/86759255666.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/rimidapujufetonulag.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/2304357626.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/99330103526.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/18278874701.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/busele.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/7259407640.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6631bc10---susezobudobatezej.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/jikukuguvijeju.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/82900950426.pdfIn PDF document text
    • http://debten.net/UserFiles/File/86741316522.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/61611895257.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20211001163524.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/refariwobokapoze.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/sosekewuneduradinefazoni.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/xujabuzaju.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/74134551056.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/vowus.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/manux.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/zobezajalakuforibobases.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a08cf2f5f---tabaxenagunexed.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/gevowezumidumi.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/6755927247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=have+clean+handsPDF 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_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 18520 bytes
SHA-256: 045ce20960f556123fcf1f33613f8767726478a6838d120878255cccdebdd863
font_02_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 10116 bytes
SHA-256: 908530694b3eb3364daa43c4afb222057e0a93707dd1bd722e6194644a9a4171