Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a14be9535fd727d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 00:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e31e9873411dffd6ad1891d683e6b423 SHA-1: b94d75537396d66434f6a0ea6ef562d29899973a SHA-256: 0a14be9535fd727d1f0694206f02222bdd2d19eb9dc9e5b7d2b5df6a989e8dd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting the PDF itself or redirecting to other malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc670374c---silumevesekakurifoge.pdf In PDF document text
    • https://rm-parketi.si/uploads/66818500660.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/rorev.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/denibafetimuvewegenijibeg.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/dojesibez.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/msn7n6tl8fvdaf23ea47j3o4g0/mitadisogudiparubob.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/6134651330.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/28744112776.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/kewagilirawejod.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/pekiteti.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210909130214_4ww5xv.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/62403584316.pdfIn PDF document text
    • http://gerocuki.hu/user/file/losepokotodoworel.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b7b1651ed5a2fa429b0ce0611650cbb6/saxewovidadapekafosifimaj.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/92801378776.pdfIn PDF document text
    • http://meditopthailand.com/file/93391806599.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/11765422371.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/4479668679.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/vujanikuxudofaluz.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/pafebabawuwarofofero.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/robunifa.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109071535103839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=restore+data+after+factory+resetPDF 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_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 10384 bytes
SHA-256: 06593c79ba380ceb89784a47f24ab4bb0cecaff498d8d9bb4c5bbb2a0135c5fc
font_01_sfnt_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 16840 bytes
SHA-256: 6f4a3d46e3faf9c8627c2d3b56aa62078d85db739b0cf88f0748dd066fccc162
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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