Malicious PDF — malware analysis report

Static analysis result for SHA-256 8576a2b3770231a4…

MALICIOUS

PDF

115.1 KB Created: 2021-09-13 10:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 303df6d93686b1bb3e5207ba0bd45615 SHA-1: 014d5e697f0bae900d40330b7132a14d5e76971c SHA-256: 8576a2b3770231a4e7d7369e4f1e34a9744a32c99ef3f388cfb08ae54738e4df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, likely intended to trick users into downloading malicious files. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pass-eco-energies.com/ckfinder/userfiles/files/55607419840.pdf
    • http://giovanniseneca.eu/userfiles/files/34481887308.pdf
    • http://kronospan-mofa.hu/editor_up/sofakufemodebelelusodot.pdf
    • https://eownauto.com/uploadpic/files/wemejevosogumapelat.pdf
    • http://cameragiaminh.com/upload/files/ramitoforuzapa.pdf
    • http://german-ex.com/images/blog/file/77276418830.pdf
    • http://telegid.tv/userfiles/files/7348581001.pdf
    • https://kawanmto.info/contents/files/renumoxu.pdf
    • https://open-call.fr/uploaded/files/vizijeponisorupevudirid.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6cfefc61---36599854155.pdf
    • http://leadingedgecorporate.com/user_images/file/pujiloputululajegofaxapen.pdf
    • https://sonerofset.com/userfiles/file/86928537043.pdf
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/galabudokaduviraxogitux.pdf
    • http://mayjack.com/upload/files/93172371431.pdf
    • http://futboltotal.net/images/files/46853226357.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ff74fec6---sodalalonab.pdf
    • https://cncunse.com/d/files/38225964084.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e2ea0c95cdefd73d109d1af198386ca6/xabasumozigebudevorif.pdf
    • https://equalitas.es/userfiles/file/55894368523.pdf
    • http://sz-nuoyi.com/Upload/file/2021090702302167724.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/zewajodamo.pdf
    • https://bold-iot.com/uploads/files/202109121127133956.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/78972366592.pdf
    • http://geoplan.su/userfiles/file/61137450089.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mechanical+vibration+6th+edition+solution
    • 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_off000161dd.bin
81b3e8098cde4e11dd2f2a2ac0dcd1f75749d8263c8b030422aace9ecdd48489
pdf-font-stream PDF embedded font (sfnt) at offset 0x161DD 16784 bytes
font_01_sfnt_off00018d06.bin
c6fe848343445646ed53a0b099e0d04db1e1ac5259c655fdf17c70e9b7375008
pdf-font-stream PDF embedded font (sfnt) at offset 0x18D06 10932 bytes
font_02_sfnt_off0001a652.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A652 16792 bytes