Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba3625f8dafedee…

MALICIOUS

PDF

88.8 KB Created: 2021-08-22 03:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d83b688dd14662e314cd2c213c1de368 SHA-1: 2339b5b00b7e3d96ac7fc408b6bedf2441a5c508 SHA-256: 6ba3625f8dafedeeb2b4f936f0c941b2730c8ee877f3321500679bb662384aa6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised CMS upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://stadion-zarya.ru/ckfinder/userfiles/files/82876841347.pdf In PDF document text
    • http://erictex.com/ufiles/files/2993887288.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/80073520573.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/29311762761b1dcf46ba05105e72a933/30227620815.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/97291563910.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/f18b0e2df58c87591c904eac108794f5/78858372014.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef64a05823---gasadigapo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783ca01615b---jowugovono.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/32153046043.pdfIn PDF document text
    • http://dso-fuzine.si/docs/29094016227.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/xupeguvotumulejipesazep.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/98320461711.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43ec9c0c3c5d5af1c22ceac9f95bbff5/84945422504.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f635aa826---32620117888.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/petenoxasavozovameletuju.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/da9ffcf4c7d3ce749331632b611de810/8943925583.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/88076489601.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/87397746565.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/96e46888159c153dd3a261e95abf3d3a/20899420032.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b5a8e2ca4---vazetebunanapunurakaw.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/ginik.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2379c2bf2e19e211b575c4a269b77bd5/xodalokis.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/dosofugesuk.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210819_D8061CBACC4FC7D0.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/27397771789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=discord+bot+specific+channelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 17100 bytes
SHA-256: 3c943c83d2999bb9b1483fc8c94d3f0e75736574a805ae258d1120c8d90f56a9
font_02_sfnt_off00012416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12416 10860 bytes
SHA-256: ecd37c14eade40eac76829153fb68f8cf447d56dd7de20998e316604eba85296
font_03_sfnt_off00013cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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