Malicious PDF — malware analysis report

Static analysis result for SHA-256 386ebcf7be143c41…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 13:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3dc4ec9ced76bb3d895770749b34f151 SHA-1: d31342eaf034ddbe80ca282b45d0d3d48e9af02d SHA-256: 386ebcf7be143c4131ed3edca78afbfad416b52bce24967fd5b1996bb7e10636
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern. No scripts were extracted, but the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=citizen+wr100+watch+manual PDF link annotation
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd7b3daa1---52585167957.pdfIn PDF document text
    • http://iscelenie.info/files/file/figagarapad.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/doxatavinageniwok.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/sokavilomutoku.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/30897720106.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/tumibirako.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/nekozixaxulomamaxoru.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/75824126284.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/rejiviw.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339e548f69d---91009588533.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/wodulo.pdfIn PDF document text
    • https://mikludava.lt/images/files/tadefowaribojesu.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/30694443847.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a84f47e13d6c092aaa64adf3e22e66c2/31967638826.pdfIn PDF document text
    • https://avenue102.com/uploads/file/99446792320.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/89581536054.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/gaboxolenuvaxaz.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/womolonogexan.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/8868770933.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/jubur.pdfIn PDF document text
    • https://polaria.cz/images/file/15183624.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/garajudodopidunu.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/getedisepafudazewo.pdfIn PDF document text
    • 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_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 22040 bytes
SHA-256: ac350c944858ba1fd236d505a15aef3ef5200d70fa018fb062c2130acc60eab5
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 10660 bytes
SHA-256: b17dccf42688afe1eb4e529045102ce42fc59b644c243e20a03d54c77ec83dcf
font_02_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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