Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95ffeb2b94c6a9f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-10 20:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8deb221452987f4edd004451497ff3d8 SHA-1: d698861bf4c5cdd98d08866428d37cab1fd9c3bc SHA-256: a95ffeb2b94c6a9f6b58c3da74989ac7c9fcca87bb1c47f4552746ff62164baa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://short-story.ru/upload/file/85763025439.pdf In PDF document text
    • http://ekonopuntos.com/campannas/file/74341885261.pdfIn PDF document text
    • http://raczcsalad.hu/files/36311315073.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/depigewimujigapikapuboler.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/52468740856.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/sajuvupebeg.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/81694272902.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/62233885352.pdfIn PDF document text
    • http://flirdining.com/uploads/files/kaxibite.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/kosuvunivalubalugatigudod.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/69294614825.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/66036611417.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_123709_156.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/8580929954.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e1nls47cjlkidhcd6qp0v6vj17/timinegofoto.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138edc900f24---munuteforativukari.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/kavuzugaboxenize.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/56264838499.pdfIn PDF document text
    • https://birotex.rs/images/files/mubejerefotivela.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/datadaw.pdfIn PDF document text
    • http://learningkey.org/userfiles/62579923139.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d63c91d0d---bedawisixapaluruzuvax.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/29367890109.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/romosusedoviwo.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/3173909258.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/fedojiwifajezipaxinojetad.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/niwuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=plot+bell+curve+with+mean+and+standard+deviationPDF 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_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 18644 bytes
SHA-256: 715f34c64513c7561e2ce28fbcc3d2d7a9ddc1f36a5118dcf9ee1175b4ecd963
font_01_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13680 11028 bytes
SHA-256: 9339ce61853095f1ae88e88bbf9bd0780465d90006595fafa6c21c17a076f14e

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