Malicious PDF — malware analysis report

Static analysis result for SHA-256 85574cbc23a6b4ed…

MALICIOUS

PDF

89.2 KB Created: 2021-07-17 15:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 338df0d905c74fd17ac2dc1bb4de4cae SHA-1: cfa574c71cefd67fef806163fe56dd4a0c2813f8 SHA-256: 85574cbc23a6b4ed30e530bfc1b34d228dddf3b07cbe6bda4aa1f65438bab24f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The file's structure as a link farm suggests it's intended to lure users to malicious sites, likely as part of a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e3a2e830126a7d57e9899de4939cd1c2/39363871126.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/dalixevifivafa.pdfIn PDF document text
    • https://coil.hk/upload/files/nobazisezusosabo.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/65178485387.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712ec4e88b5---lezut.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/39fc55421e3737b65ff5810110cabc74/36732018740.pdfIn PDF document text
    • http://salkim.com/userfiles/file/siwak.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/67012166097.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45cd8ac23f---vutosifugaxazupexixu.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/sodirapanamisagilaji.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/56801392413.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/37376068211.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/juxakifuzesupitobefikopof.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a94fd6fd2---15446485530.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d0ad69807e053d44bffb96903a5b2cc4/81102294941.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/86188706654.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ki3p9a7fvu13ef3joejo6tud96/gelunavatu.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/25888427763.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e231641b16---50415912766.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9d421119---4892360898.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/955303a03af4e763472ded47dee93a59/28963694602.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/29736183747.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/29543971204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=spitting+in+someone%27s+face+meaningPDF 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_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 18088 bytes
SHA-256: d1be47c1862f1bc95203964ffddd20f95172654920fe638eff0adf7e0632a5d9
font_01_sfnt_off0001264b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 10788 bytes
SHA-256: 1531edf7d951ec4b62c5f78ed56970e63faff608d4e2047a524400ae0cc4a7ef
font_02_sfnt_off00013f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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