Malicious PDF — malware analysis report

Static analysis result for SHA-256 80483b4b392e847d…

MALICIOUS

PDF

96.8 KB Created: 2021-09-10 06:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89c843cdfec7fb42e365b9291d750894 SHA-1: e53ce22499361fc978696379dfc7180a1689703b SHA-256: 80483b4b392e847d11c033da67dfebe5b89313361b69ceadc3d00083132476eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://xy-interior.com/uploads/files/202109091010095256.pdf In PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/49647514362.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/nigazavif.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336e655b074---22851169671.pdfIn PDF document text
    • https://mashura.co/userfiles/files/webedotigifegetizanizo.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/xexewuresi.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/79854478097.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/51845778169.pdfIn PDF document text
    • http://www.puhito.hu/uploads/moxejikubede.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/36618901848.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9ec4ef94---38633038410.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/73233770155.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/98944315657.pdfIn PDF document text
    • http://flexa.cz/docs/file/buxuwik.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/21555226923.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/16473586982.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/89012816919.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/43679165283.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/41684452346.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/fakamemixefeb.pdfIn PDF document text
    • http://nincity.de/inline/file/bugujositaroroz.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/fowatususoxakijamuvomaf.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a6b46924---95020395870.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/98140701114.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/91609216089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=17+indisputable+laws+of+teamwork+summary+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_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 11196 bytes
SHA-256: 472bfb7116b150fafa8331c9d98460e865b71bdc77988c6b0f632b37103d6837
font_01_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14585 18604 bytes
SHA-256: 627f67a182e3e0216e16237832049f64b2dc64d0b81e7a86d80477aedce9a52b