Malicious PDF — malware analysis report

Static analysis result for SHA-256 121e50bea207b43f…

MALICIOUS

PDF

80.4 KB Created: 2021-08-17 02:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d839a51c13cb8b0d56b13aa6ef0749ec SHA-1: ec8ff48dc9ebd36c3fecccf7a58006920d1e916d SHA-256: 121e50bea207b43f1b063cb19d9c265e87f1936067c8211c72810e2079bc6d37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the URLs and the overall detection suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=class+attendance+sheet+template+excel PDF link annotation
    • https://n-zvuk.ru/upload/file/wodogigariwibawada.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/80fd53d55e056a4a4a20a8be37414690/komejavapujoxa.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/89400039850.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ih0cf03usits3b94nbc1dg2p87/jinolatunuzexiviwabuv.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/44350967283.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/jubimanonolo.pdfIn PDF document text
    • http://jngf.cn/files/file/wuwepezo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2de0624a---pikax.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/84ab84928dbd8015e8affe174e421db6/gokinaxetexarefujowuret.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/zanugi.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/28819882224.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210529205349.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/tusenazowotiwonide.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/25349154201.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/wesibarepozanomafapojow.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00a70cffd---49916822653.pdfIn PDF document text
    • http://mousike.it/img_ins/files/14938795058.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/48566798e099a6186e92a36d29f8624e/89167736724.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/akl9pr9900ctnp1frl0j3fcei0/nutosokekixevil.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7232fef28f1bcd82296e3168e4e29a6a/xorigilidegetozaj.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_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 16324 bytes
SHA-256: cc7b08a20394bc702b6293bb6d6a59631d6178b79a797507147d322eb47793ce
font_01_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 10600 bytes
SHA-256: 461560dc8894a57b0b7b54485c29bce683c109794826cc0672f06b6216168723
font_02_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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