Malicious PDF — malware analysis report

Static analysis result for SHA-256 245d2eebb8f2fead…

MALICIOUS

PDF

89.6 KB Created: 2021-07-01 10:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96c3eded18a2af1284e2823956fb89dd SHA-1: fd5b675915462d9a644b96b280f4b7755a8e0dab SHA-256: 245d2eebb8f2feadaf546ca330aae5258c545e9ac8db22d32a6f043d3679f876
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious content. The presence of a 'download' button lure further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=army+school+tgt+previous+year+question+paper
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adba25b1fef---somadomifukinakulopijizon.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/zowerepikoxotivusedije.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072baecc9429---pipenilogagesusejiko.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b199f190---gosimuzorigelu.pdf
    • https://ckmandarin.com/uploads/bunosibufinejazujakinag.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087537458976---wikinukonarobowidadigiw.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/guvavowemedujibod.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/bvttl6mma0o1jnrooc30v82fhn/40456084259.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/571v7pj87djoh0p4d2d2crn2u3/padonopewupi.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0394796400---38678609375.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/517dqnqstp1d7k9au8ord8b9i7/78092190311.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fa010081---43220377129.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/07c994c09a6109ca98edccc90a574e6c/1557679238.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7prc4jd9h5i03l99bfbbng11kt/71134135601.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/bkid9dcglu563dfsaj8q54cdc3/147693434.pdf
    • http://kamarkosong.com/contents//files/32976105354.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/f9s6m06f5275rtpkno4gh184q7/xekudubusisus.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/366bd726bb4b3aa55144908588dc94fb/28640899172.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/03p14ctuothr5o4ecglpv3vrs2/fivixopelusizajulekaxulan.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b003976be3---5659083149.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bba5d8dca024921b10c58d580fed1e3c/3645032847.pdf
    • http://ipost.mn/ckfinder/userfiles/files/muxuzerubasadina.pdf
    • http://ahcxdq.com/uploads/file/181612522833.pdf
    • http://obasekiestates.com/UserFiles/file/nekotevijexokaminudop.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/00anpmjh2vg8qur1acvinbdqe7/dazotasegeko.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a997383fd6b---bezokeb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 16792 bytes
font_01_sfnt_off00011274.bin
93659cc53ca2fce6fff08b43a6de064cc56051e0bb32b7b752ef3b8caf323197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 11228 bytes
font_02_sfnt_off00012c60.bin
0181fdb6ffe68e09e0dc3f4595749c382bcc50a748117eb4dbc2907e8affe12a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C60 17132 bytes

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