Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4fe38fe5c6acad…

MALICIOUS

PDF

72.1 KB Created: 2021-09-11 02:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba027c686f7963102e784e0f7bd82820 SHA-1: 3bf75cf035cbd878fb4742166bd2d6f51ddfe07a SHA-256: fb4fe38fe5c6acad9104ed71d13ef70f92729528942c355deb65d3e72f9d9e09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://chickendaylacrescenta.com/uploads/files/98377509502.pdf In PDF document text
    • https://frutalmente.pt/site/upload/file/fetuzuxuwekawisedusiwu.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109040858008865.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/zuluretivanir.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369e7faf49a---95147886780.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f16bf41f1---viwigejobudipukajilupe.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/91881448775.pdfIn PDF document text
    • http://soc-in.com/data/media/files/70885013530.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/tovenulusijegis.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/fisirotufodaxogemefujaw.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/petawe.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/50930994063.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/84585240159.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/dunusu.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/mogurekewinetekaro.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/furabuxonebalutopitim.pdfIn PDF document text
    • http://rilta.net/userfiles/files/tuzimotemeviluseluvuk.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/nelirewenawikupamakarutaf.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109110550118965.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ef39eb11f650c927fadcd37c29f2a0d5/litakogobabutenafabuvix.pdfIn PDF document text
    • http://oris-am.com/editor_up/48444567506.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/tedofekenel.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/46949536747.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/lumaw.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/80496659820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+mighty+quest+for+epic+loot+apkPDF 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_off0000b41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41C 11236 bytes
SHA-256: 0892a16e022097c4dc2b83b784a6dd43438b4ac206bba782384dd9c15e37495c
font_01_sfnt_off0000ce2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 16884 bytes
SHA-256: 12418a8f5f03e30011aebb42fe6994536458355ed9cafe3788e4f7159125057f
font_02_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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