Malicious PDF — malware analysis report

Static analysis result for SHA-256 42799ac1a7060034…

MALICIOUS

PDF

146.6 KB Created: 2021-09-18 01:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc542bac5457b6a46c22dd45e1866606 SHA-1: 32650b46335d48d782e7ce5c9443a303e05d44cd SHA-256: 42799ac1a7060034d36fa33438ebe7a3e3ea6164c5dd8b5bbc076029bd924ff5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with many embedded URLs pointing to various websites. Several heuristics indicate that these links are hosted on compromised CMS platforms or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the nature of the links suggests it is likely a lure for users to click through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xadunevubalivib.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fa306a9cf1be36194f9deb2cc15eaba6/12741231137.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/nolavaxul.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/89351017073.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fa23e9e68---45959412564.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ecd5f35fb---5923514532.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/nikonemudemot.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/79582786075.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/merugotoroxoledarogogo.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/5696963446.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/pejipurodisemoked.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/bf5045416d5230cc27c327f791a38ed9/57003259574.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/26584189271.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346967374e4---15146942632.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6edac97ce2dc18f83a1486aeb15b5600/72052395387.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210910141334.pdfIn PDF document text
    • http://shamayachts.com/upload/file/30768882834.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/rularozesopugozizivijuk.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/munagituv.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/66457930598.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/dotifoxexetesupexudelux.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/77854265633.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/36507765278.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/togitudomutunozigabagi.pdfIn PDF document text
    • http://talesma.com/E/file/sefogazokuwaponazofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+free+diamonds+on+choices+without+verification+2020PDF 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_off0001d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5E9 11364 bytes
SHA-256: f505ea8324c58893525537c95be0c025e799fd1d57a9760001f626ccaa5b6f63
font_01_sfnt_off0001f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20876 19200 bytes
SHA-256: 49fda1822dc474e984d5001ffe8f9445eb80053cb01396767ac302c1b84738c9

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