Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b75f3638df3e1e…

MALICIOUS

PDF

96.9 KB Created: 2021-08-11 15:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09bf488bcad44a4f4b1af0c7685a1617 SHA-1: b4ca3552c948e3ef625ec0cc91700bb3e2f2b7fd SHA-256: a3b75f3638df3e1edb35c017d3ff91f82d7ac9179ca65828ccdbba9ab9be4c40
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The presence of these link farms and the hosting on compromised infrastructure suggests a phishing or malware distribution campaign. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d96b2402125---10652032921.pdf In PDF document text
    • http://toanlinh.vn/upload/files/67755619574.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/528b6b40bb0a729a19172ddcec2601a0/64355434369.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/tizevibezonazogopemoserow.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c27cc89899a4e55751a47802d4e96f4f/82976001079.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fd3a6592d4c748abfd14a4076e8f4fcb/vefopetapexexagazasosa.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/gaxar.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a483caddba6---taloxufeziperakaziter.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/5937918118.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704080ed585---41021418439.pdfIn PDF document text
    • https://tsegypt.com/file/86958272523.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/51741273875.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/n35ggfkno41hc4ng0163gpattk/73366915860.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/dulofewoguxuruse.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb9fdd9418---buzijerezevena.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b4a8f228---69304215996.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da74f64656---64711122983.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/jelumitolabosuzagufurepax.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/ledefikulazixaxifugu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b8b8b8f5---jowefefixig.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/08372d1141735414afe976a8818a7de8/13893671825.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6585edaad---11919885180.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8439342c3---kulesoxadajobavavuxemijox.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/79688483446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+become+google+level+1+certifiedPDF 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_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 17796 bytes
SHA-256: c5507e4c27432be7d0f4e701e5ee7517de7e9c547bd8db250cfa34805ac34468
font_01_sfnt_off00014367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14367 10720 bytes
SHA-256: 82305feb6ac3038866cfe4381244c75ac2ae62ea1541785e1293b290db53fd3d
font_02_sfnt_off00015bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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