Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52400b674483abc…

MALICIOUS

PDF

68.8 KB Created: 2021-10-05 11:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5070e671ab4b8b527a22b542f14fad19 SHA-1: 75682d241d530a9b7fb661ae0d605e870cf4cb32 SHA-256: f52400b674483abca9855d935a8f9ed4ab864bce09c5a0c16659d8d26dff1af8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure due to its small size and image-based content, typical of a screenshot designed to hide clickable elements. The document body is heavily obfuscated and unreadable, but the heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laiyi-art.com/userfiles/file/gesinudaze.pdf In PDF document text
    • http://af.ssla.ru/images/fornews/files/xonanabukakezebezur.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/23856966697.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/44919934639.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/16132862030.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/13717325397.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/zavigeduzidexejalarelug.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/72357888373.pdfIn PDF document text
    • http://a899.net/userfiles/file/58329120367.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615382075bec7---mujinobijiba.pdfIn PDF document text
    • https://vatlieuchongnong.baohohoanglong.com/userfiles/file/pixuniwopojusa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d031981c6---62112399321.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/6487777433.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/wedurel.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/83825514611.pdfIn PDF document text
    • https://rubfila.in/files/file/47860166716.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/bopuleloroxesezun.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/mafudewixurakujixaxulof.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/wesub.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf1e41cf69---zopikawudisowabor.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/85946401599.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/budukar.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/pisiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=smash+ultimate+tourney+legal+stagesPDF 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_off0000b166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB166 14196 bytes
SHA-256: 57a11b978d3ee0e7ed6e6c2c6e7d50860d774b489ce9fa3d68bee2c26349c224
font_01_sfnt_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 10844 bytes
SHA-256: 31cd932570dcb129df4cd4487f875ec82f3c94d6145e7d014d61a10ab5cb6583

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