Malicious PDF — malware analysis report

Static analysis result for SHA-256 caccaa3a7081ffc4…

MALICIOUS

PDF

90.0 KB Created: 2021-08-01 02:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96ef99685682f4bf3ca4b57101411c42 SHA-1: ca694d9023742f3c1b5b950aaae4827b6c5d0b47 SHA-256: caccaa3a7081ffc42eadd77cbaf14307298074e7d1b0e69b26af8cbb513a91e8
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files, some of which are hosted on compromised CMS uploads, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://innovatepc.com/userfiles/file/nugevadiwek.pdf In PDF document text
    • http://alemotta.com/resources/original/file/votupif.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/46411077838.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee373f29ee---tatuxutokafegipiwovusa.pdfIn PDF document text
    • http://ned.ru/uploads/files/97920929254.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6fbb9aea9---gevimunabomulex.pdfIn PDF document text
    • http://uci.ir/userfiles/file/diwinoxefuzijujalasuzol.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/31376586693.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/98812849151.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/81539648518.pdfIn PDF document text
    • https://menu2uplus.com/images/file/46187578998.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/39213068986.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/386dc888b51cd4c490fa3a11b3eea59e/gakekesarabodobuz.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/v6hmtmj4o6n3765l1qemqbud7i/80500136935.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7cfb2d5bd842d1a3d860d5aa3aa360e2/gijelijilesiwapusemonak.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/55447354895.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a4ea109def8f2582b27ca114eb210e03/85374211961.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/nijapidukadilexekatezivu.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/jegewosisewufovorametek.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/h8rprsmt590q7hq6136u0lbiuh/28579482795.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/88074774678.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/lipegogagozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bahubali+2+full+movie+300mb+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_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 11112 bytes
SHA-256: a0e8a087fe3ff4ca1b98c38957438a2914c36fce1f043234e35508d6f21d63f8
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 16988 bytes
SHA-256: 67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b