Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d81558c3929258…

MALICIOUS

PDF

70.7 KB Created: 2021-06-30 20:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0fc9aae6a37ed0a040244e16a93a3389 SHA-1: 73377ffd05f89af1c1f96617f6c3ef29ef4579fe SHA-256: 58d81558c3929258d25b696cf9cf893d863380cd73769a8bc80f2c8c39234cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=expository+text+patterns PDF link annotation
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/16156032533.pdfIn PDF document text
    • http://jp-cable.com/d/files/88995914931.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/newevekudajodiragaj.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210522150631.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c18fdd106---virerexejodotitagefub.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/11953187846.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/66536233827.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/13/file/20210513_001858_148.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/kunadovikadezaw.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/gejolitixapuk.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ke9aj7eriog60evi5ttcts5ot3/30564625411.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab0691dca---85408516274.pdfIn PDF document text
    • http://elskenecologie.nl/files/fumafazosulabemusebepo.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/34776757137.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0f40afd1a---95998758210.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/97706244364.pdfIn PDF document text
    • http://ashioke.com/images/library/File/31752848244.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f94ef08995930c2bf489e6e540ad116a/ravademapuzot.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078072474088---5769755113.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8371beca1481fc6f42f3ce645eb7a187/35003743893.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/50503373724.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/267c243beb0c10f7404de697874bfefd/xomisewasedapijow.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b59bb170---pifazax.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/l0g29h52sgu7sefpai2cr59g74/44858342731.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/zinijomolevir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 10400 bytes
SHA-256: 084f2c4a0909f3994460629503548a02ce7e27367b0f8c03218b453590f27a18
font_02_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 14976 bytes
SHA-256: f30e288c6e00c4ee0cd4f9ebb5065cca2ade0d8b798b349c4b66540c00835584

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