Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe56b21b09ba188…

MALICIOUS

PDF

95.0 KB Created: 2021-07-19 21:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7a98e3aa68ad589e29ded2b9839668f4 SHA-1: 96ec35cc96fdb93c36a17d947037eea20196f154 SHA-256: 8fe56b21b09ba18850063451aae931cddd22fa196a2f56d2ca3b5e45ac498ae4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and compromised host links supports the classification as a phishing lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mwflower.com/upimagesfile///reliledepitub.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8b67c960---3063106346.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106241723457873.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3da6b34235e07e61cc8175df95ab2e45/bebeje.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23d829300d---lulolaxufubolutifoviriwuk.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/zanewexelobupepixomobuwa.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sonofus.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/puxuzikob.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37861611603.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/povanugo.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/57584484072.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/bevev.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/vitigerukepime.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/gimelurosomifasozipusuxaw.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/05149f5a60c8081d1fff4dd3b2676429/37955196382.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdf411b6f2---65053410118.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ingmlmpcmqdb4jknf51efvakps/95371855848.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4d2e7130fb474a43bbed309d3ed4bad2/47661400978.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/pijotapipafotelilup.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/17786070508.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609869408f53c---modedogadamiliduli.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/dacc4373e248d206cbfd147d2f6b1bd5/26952844724.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/98836088078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=npv+and+irr+analysisPDF 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_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 18020 bytes
SHA-256: c86d2893d580b7d1ce75e70925222b9aa8177a30e3ce6d2dcf3e41a8f626a191
font_02_sfnt_off0001584a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584A 10192 bytes
SHA-256: f166003442a7a2d2b1c925fdec1eb2c72a4ff3e4fa8ddef5a07cc020394d73f3

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