Malicious PDF — malware analysis report

Static analysis result for SHA-256 7748c9bbab2d8dd7…

MALICIOUS

PDF

91.5 KB Created: 2021-07-06 22:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dd062adff3f9810413a9d480146eb599 SHA-1: b95520d7bcb00a353e3c8073ac43260bd77a654c SHA-256: 7748c9bbab2d8dd7e3ff9a6df0e20cb6c9164a793507303dc6a5a672e549f10d
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of multiple external URIs and link farm heuristics strongly suggests this malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://coretry.ru/uplcv?utm_term=mod+apk+moments+choose+your+story PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6e889a9bb.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ntpqt8bnv4fgarplvrcbfcvdq8/fosifap.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e71f7a3f9c6c650b48237fe85522e33b/34687058411.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/97417981602.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/butigipisenakoka.pdfIn PDF document text
    • https://33mobility.net/uploads/files/78786087409.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/doduduxinoviwepawuloxar.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972bfe0c23e---metabun.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160818a495d1a7---xutilufi.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/larevaxaxarinizizo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c42593e1ed5bcf65275cb24ee8e6ee93/52038150024.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077368d897d5---xamarikipuzosunatutoxa.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dbrbdkbfp0f06patc25v2o5ie3/922158573.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8b54d2ad---bewiviwafugujaw.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/59909150571.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/16784e3181699249e94fdafc38ac9e37/64703113875.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4dce2c83f---49959450487.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/aa92510358b422641359f602b9777a80/zugidul.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/vajateno.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f130afb3---57331700796.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/333aafb0232c2d890485d93fa88638e5/48641251987.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/tilotojirodijuxipubudibag.pdfIn PDF document text
    • https://zzhqhi.com/d/files/21844888263.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cj01b555dn50d1jc3896t5vu3n/1721588513.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 17764 bytes
SHA-256: 5dcbbf1f2bf7ea4af637e767b42ecab045800e6536af3b3564f938205d9e60ac
font_01_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 16272 bytes
SHA-256: 6db0f6aff302517959e771341526719c7cb0bccdb624e9d69e423217ff3f1916
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000146e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E7 10940 bytes
SHA-256: cb6ac1e9b2ba4199f66c8eb90bfb827a636a03bc2ccc829e672bd16c230bf177

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