Malicious PDF — malware analysis report

Static analysis result for SHA-256 218accc0b364a8a4…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 23:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e35847c7cb2a3f8203114288c1afd22 SHA-1: ee6022b6f5f588e70d7e4edd769f557995298ed4 SHA-256: 218accc0b364a8a45d1ae7b02e06616abaf3fdb04682e9f8e6a02da56c61bcb6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress uploads and other disposable hosting sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://freebcard.com/ckfinder/userfiles/files/bexirudosa.pdf In PDF document text
    • http://quangcaosms.org/media/ftp/file/gikenamopogatarevaxada.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/3104092129.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/72555606651.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/xawivub.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/32058727758.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae1ad8e6f---muxefoborikirewewopug.pdfIn PDF document text
    • http://planbmedia.hu/files/dexaxu.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/20939523084.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dbfd388f6189aafd0dc705e4482b232a/kobumezezumanaxikidiv.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e79uvdoj6924e8k01lkb5v86j5/83438192331.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://www.niziointerior.pl/upload/file/33009985091.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/20539389682.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/56aea4f5b7815ffa8492f2f909bd49fa/26761740923.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210801142033.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/gopozajo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608350e05b35c---60190992220.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071dfbf61db3---folatutapegemokexar.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/97895684843.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/nijazexidusefobun.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/21007082712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+app+pdf+reader+with+dictionaryPDF 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_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 17952 bytes
SHA-256: 7e4ea14d1388e4523f9a59ddb277bbfabe44d23adc35b758079e5638d3c77a53
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 10684 bytes
SHA-256: 493b8a2cfceeac3f1ddaaffb4c040b7ff7f8fab7b6ccc678a9c9e9ab03752e8e
font_02_sfnt_off00011631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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