Malicious PDF — malware analysis report

Static analysis result for SHA-256 43629e474588be79…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 03:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbf8d1f3b6415e4e1ed5c78ec60e5bbb SHA-1: c41608661cbec7bef843a686f6a8c2d44ba57424 SHA-256: 43629e474588be79d425bfd1721b8a4b57a0e7105a6f433277fe3bf94e2c5c9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=second+phone+number+private+texting+%26+calling+app+mod+apk PDF link annotation
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/71640495991.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/xawoje.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/61833903632.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/janezosovanujodazazusa.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/41187150300.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/zepikixusidofatoxenupin.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/sigapitunuvevutebosaweb.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/namaruxexawalavorib.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108312349318588.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/sosewa.pdfIn PDF document text
    • https://bak.vn/upload/files/pobidenuvekedosif.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/27171553772.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161422ca299cd5---totuzitoz.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/2347321962.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47959067572.pdfIn PDF document text
    • http://airsoft1.ro/files/file/49991378648.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210909075044.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/2015518951.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/dojavidume.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/95184693134.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/gulisakapobolowufadira.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2515828eb4d3022c2ef2af871ebd5f59/fedibogapixusogejofu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1a5c8f0b.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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 16496 bytes
SHA-256: aa3595da9a77a6640e02ebf276625b418a861bc2731109bea5ef55dc2a169d92
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 11232 bytes
SHA-256: 15793436c0406de6eb84aa2cf4380dfdb9d7849d8a4a633113d8d81b3d5aaa74
font_02_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 17388 bytes
SHA-256: 01465e70e6f687ae966c137302f0c3d86b84e93a85fbc78105a23b3c4c32865d
font_03_sfnt_off00013269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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