Malicious PDF — malware analysis report

Static analysis result for SHA-256 a623f0ae79cfb2e3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 17:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a0fb1fa4f3043eb0edef1cab4eb0e31b SHA-1: a9e9041688907c33a0be33df2603038774f10f35 SHA-256: a623f0ae79cfb2e38a18242f551ad17803b237a02f04d345b3c2962af9929361
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, specifically identified as a phishing or trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing attempt or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=how+do+i+stop+seeing+ads+on+my+phone PDF link annotation
    • http://www.specemc.ru/upload/files/xewebozosilu.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/napatozotefet.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f8710b12fb3f41e99ace0d58031e609a/37884886029.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/60120725710.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/68163c5f422c38d5f00a9339d7ff9058/tegitovugerizinokerixe.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144370056bbd---gitewurumololegekalub.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/rovowevasef.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/jenetajubeza.pdfIn PDF document text
    • https://polytex.de/sites/default/files/46913841056.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/tutap.pdfIn PDF document text
    • https://hoavily.com/uploads/files/waperetafaz.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/1165614748.pdfIn PDF document text
    • http://jump360.co/upload/files/20210910191422.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/73035988348.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/46678236189.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/86947338946.pdfIn PDF document text
    • http://classtool.info/upload/files/kakuwaxew.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/gofaritipetexewu.pdfIn PDF document text
    • http://lecostationery.com/files/file/vudefekewepemi.pdfIn PDF document text
    • http://tcihk.com/userfiles/tefudegisalasewamuto.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/79707690592.pdfIn PDF document text
    • http://strandedtattoo.net/file/53750323524.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eb18cc61b---kukozevojerideneler.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_off0000cf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 10884 bytes
SHA-256: 267ed25542aa40500da5609abf6b2bc5a28f463d1053ad8fe0aa4a1c952b1283
font_01_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 17516 bytes
SHA-256: a9388f7782316b29fd73bfccb9c569e082be4f2fac6347891f123db2cec3ae92
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1