Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f901f6fb8ee54b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 19:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f6fb11d156b2e9258e1160aad812b8c SHA-1: 55d5b4956e165455f4390b78fa55339ea1cd6d42 SHA-256: a1f901f6fb8ee54b3f2dfdc73db20240a5c0c3972b4841bbfd41d0102b02dd17
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm pointing to compromised CMS upload storage, a common tactic for distributing malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a method used to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7368e42a7ac3d223c8843296f270ac40/vawewilokoxi.pdf In PDF document text
    • http://10glazsikeyrosa.ru/file/92661049302.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0048b085b---87144800523.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/foselanusixidex.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/turuki.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210812211711634157xgijd.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/69498582321.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/25204595548.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/76055078717.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/medinadofuvuxofegu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dhqfjgts9u4jnchouiu86a5jd7/92218074924.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/65980624449.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/47225472706.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/33158399572.pdfIn PDF document text
    • http://falerisztika.hu/tmp/9350309376.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/nenivorewesezigugalivize.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3129ef59d7479089506bd08ab73656ea/warome.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/78551986133.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/64112821114.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/75799095167.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/96782382361.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16128157d3b7ef---21204513675.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3602bb2b84---75628445854.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/31842902316.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/74063184538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tp-link+cpe610+manualPDF 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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 10580 bytes
SHA-256: c32a040f930885ab2f7b6481f0708a1cad0cd0a43acb090fb7f7b8555aa58df6
font_01_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 18216 bytes
SHA-256: 00ca4af842f76646ee3a867f5ebc81abee0f7231e4a21fa3bd6b44bbe2595fd3
font_02_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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