Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e312ecf5dee487b…

MALICIOUS

PDF

88.2 KB Created: 2021-07-09 08:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 649486f3967d0a83621728f936742b70 SHA-1: f186234d08652ea85c91b3a36d157ec3ce81a6a4 SHA-256: 1e312ecf5dee487bc128f232ceaeeed68cfca01d8ae0da7df5b4c1f22239bf19
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b348b5d35e---56351607621.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5165cb118038360712164174028d740b/28088023456.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/bifofutetutogud.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a434f4c60f6a830b183740db18751d03/8741371824.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095db0f4e13d---71113644031.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160817e2f72b2b---luxazixesiguf.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/86368398048.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/tatizuzakimapek.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c334f7b10c3---85502386382.pdfIn PDF document text
    • http://rld-carbon.ru/file/dadidomuvonadivofu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093b01586ad3---42167500812.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2f4471d6---71490397266.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/43208887143.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cb41d5e1c0915f6fc2eda82a1d19f0c5/98183246768.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zawomefipisi.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/81245657633.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/losizodarirafesiwolefufik.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed76717ba6---vajanoxukolakotokipig.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/fularum.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/51665051295.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/44945266073.pdfIn PDF document text
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7nnkcele8vqffnde54pfintdu/puwizomupejanez.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/2q5ininl3fv0qv38o7cbb8lnn0/gowapefixeguwilunimeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cayman+islands+attractionsPDF 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_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 17612 bytes
SHA-256: 51e8bf4d2353140519ab3e34639698f37f77a8cea479f360edaf4c1b5ad491a2
font_01_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 10544 bytes
SHA-256: ee849bab85bd7d0586165b88dbf554a91acafe5d9726ebac4b1613222eeea2c1
font_02_sfnt_off00013b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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