Malicious PDF — malware analysis report

Static analysis result for SHA-256 943acd8b119adb10…

MALICIOUS

PDF

70.6 KB Created: 2021-09-07 22:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c97861a4fa65bc478b55e92fcd22da6f SHA-1: 7f890069cc472b6d0fffe45ac29ffef8674e99d8 SHA-256: 943acd8b119adb100a115c4bfb37ca02d9f10336655fe6f3f0113d49a8acb96c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cdd8fb0727561c7b46950a6487d169a7/zetipagototemiwomelapov.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/960f1d5be862c2554e6b652ed042fd8c/medefopinidikunude.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/nanowojod.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/7899741184.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/vudaverimulev.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/tmq2l4a7l6vkf8fajf5t61vclh/76510447676.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/totorubij.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210524013212.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3696b2d7e534b636378399ba50c1f111/dizipifasosegagaxefajatel.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/m2m4chnsml24bepompo1so3qt5/mulovo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070383771c74---42152227402.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/biwugolurusivivusepe.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20218212145249642.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/79249840175.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/78408090482.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/50100015551.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/xuzesigonudiguw.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7af325d17---dujugojelalufonijawusit.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/bexajakenaleveka.pdfIn PDF document text
    • http://cristalensi.com/public/File/47881517568.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608147ba97326---lunagowegas.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/66489463852.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/73744198405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=properties+of+alluvial+soil+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_off0000b679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 10556 bytes
SHA-256: c24af4d42181c8ff8779583395f0ef38c72a150542052c52346ac1f751cd531e
font_02_sfnt_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 15052 bytes
SHA-256: db7a89760004f5090e7592187443283edfcb81a1de6e98c30ace5100381edb7c