Malicious PDF — malware analysis report

Static analysis result for SHA-256 4838946cb74d2bf2…

MALICIOUS

PDF

85.3 KB Created: 2021-07-02 03:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8301c06ad3cea0982f1828fbb3d0093b SHA-1: dbed1725b94729ff19fd1a271257328d71d487d9 SHA-256: 4838946cb74d2bf23391d039a250f2628d5f8cdd71858655df044c18b59c590f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=how+to+see+blocked+texts+on+iphone PDF link annotation
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e3be77e4a44641c527572b60cb0f6ef0/29197995373.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/30200168802.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/kojujofewuferikurujitol.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb45c44a41---rapazusaxomimibibob.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/diwudiwarejajidoxevafub.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/6156683597.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b2d43613---gojinitezena.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2427c4da---zaxaxoluw.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210621065026801.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/50123363356.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4364f45513---96522870215.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4c4fc51ad---80772691937.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/12f0b4ec8a79562f3e95fd14cac26d77/89134257557.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/pemenurilokotujaxa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/958ff37793751cbb0c30cac05048413e/fumutodobu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16094b56605e1c---82815113923.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/28152783623.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106090407.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63309e2ef---dukubixiwun.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/turikipobonogi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160becffb52f29---demisijuziloboner.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/acrsqgjbmjtdoap6o9i8lcb3d0/mokotufavobiwezagalap.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c88082ce42f---fixefazesojokinopefe.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/615843a066462d392047052061483ea5/kinikidewabivaputexe.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/pariso.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_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 10760 bytes
SHA-256: d5d89e325623d3770fff26cb2e45bbac679a6f7b267975a1e86cc3f90f028ee0
font_01_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 17092 bytes
SHA-256: 9ef108ad2a2e2c2b143bfb4dc030453c7e6b6cda97794abec6e769a71efc85c7

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