Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af813a3e7f38cc4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 21:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f8944464b691d9b81383b0b437ef73d SHA-1: 20c5fc13da2841235f41e0928debe1a4f6676f17 SHA-256: 5af813a3e7f38cc4a1c43c6dd76004c375acc78fef10c87d7c1c5de931d1b07c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest an attempt to lead the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=tamil+alphabets+worksheets PDF link annotation
    • http://velo.hu/UserFiles//file/93748805558.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085baaf39f11---kexedigejabez.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/wizovegorovadogubusuva.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/zedexitesotabitum.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b6c2f4e6ae13ffcddfb15c1e6113c99f/kavatibubokok.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a06ec5d73f9c832b1df481e0399e644d/bapafezobigipumokes.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/fuxol.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/57682029161.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9a4bff88e0b14ee2a270b944844c9038/89727453417.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16111a1f8dd3b7---durotifutadusuwakoxibuni.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4fdbe3374318aafcde61b818dca7d6e7/87712512432.pdfIn PDF document text
    • http://cutskytools.com/d/files/61470523606.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/ziveva.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160de6256158ae---najuzepomerejisarij.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f23e6a2380a---bufivaxux.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/13917244966.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ee4276d5---29333521156.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/cvhdfvn22prrlh3cqbjinu6bea/lobebalegidupiz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b3be318a67d5a5417bd533d57fc58fd/96168661839.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/041d56f4e99f3393f050f0cfae66716a/97434302172.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9105290ea621bd9086445a2f3c187706/43178729711.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qlue28u6vrgh3psfmmf6h6kmnc/lodula.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/64771104887.pdfIn PDF document text
    • 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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 19108 bytes
SHA-256: cb35b17c9ac9754a8b23ad168b07bc877cd89567b25647a356bc04793c738105
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 10692 bytes
SHA-256: 9d4c96c94a697050206fe95c15fef1e7390942379fa73e18adc103f0df195132

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