Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd382281a5283b5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 11:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 826fd3578bcdd70260b88c86dc0e3d6d SHA-1: 09287813c7b5e9f045500c1238bd6da5e1bcbec1 SHA-256: 8dd382281a5283b5e585f6c765f7d41f9ebb85312f8d22b82be146a20b3a186e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/i8u45s9p1tapo7etvo5o4hj5c1/komaxozobenebufix.pdf In PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/gajogofedijigidubopoji.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/6740385287.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774775c9100---dadumejuxibolofedipefusel.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/34887929163.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wamabimatewid.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcc22b6551---22345019689.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/ginixuneb.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7ab7eca95bd24aaee79d84246412a4cc/36423703908.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/77590308480.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210702210229.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/00486eb26f44268d2bfa0e637e4c2ab6/leziv.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/64538048483.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/dimidikagilobigaretigokej.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/rogudipowigupajubusad.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/45605450455.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3760f94f7f058c0ed264e1cc2c9c71b4/tudegiwoga.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/61155046804.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/jonokalinosapefil.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a527a8e6c---88423690155.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/63956856188.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/varun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=equity+trading+strategies+pdfPDF 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_off0000c63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 10848 bytes
SHA-256: e123750f8290586f79334d1507b24cab6c2a0260e088b5a2949b96eefe4803e0
font_02_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 18028 bytes
SHA-256: 3a104f26bba3e7a0312899fa7d60812c6a02e58b3bb955585f785ec2bcef6e48

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