Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6be7775feab29e…

MALICIOUS

PDF

92.0 KB Created: 2021-08-15 03:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a499a00c1ebafd5091f28dda8dead768 SHA-1: 53064b32cc8ad327356518ef0bb65bfad1544297 SHA-256: 8a6be7775feab29e174bdec286396af45161d9290a9dc4c007ed159c6d1b7922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=hindustani+classical+music+theory+pdf+in+hindi PDF link annotation
    • https://urbanshapes.in/userfiles/file/muviz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b12d65d5052---21180282009.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160737a1f64fce---wasirunojegatubemuzan.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/82325748212.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/57216739497.pdfIn PDF document text
    • http://teraval.cz/res/file/81013336358.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/ruzipix.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/lofafenoginagufujiv.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/12816712946.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/27rlg17nvabd94q2jm86tfmk22/xowevigek.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ce780179db8---64977757987.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/xadidikinumonubuf.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/30388232347.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/10e7fa78dd180acf9fb53ce4f5ed27c4/zewuwezonenikupilaxafad.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/mijaradogoxaze.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/folikadupunakoxepa.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0ddb5bd83a---5463102887.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8257a12e18ad2dc6be432d0f2ea6dd85/minafewukofejokunorojod.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ef107e8f07f498e83dc7d3fbd6fddcd/tijapikiwefu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/94388254141.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/banivalozibogujiwororat.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/veludolukabuzu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078795a1e0b4---gixes.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_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 11092 bytes
SHA-256: 1a5ef7fe72053f6f230e16327cc8d0544aeaa9d4ebdee73e4c1739eb1cd6e280
font_01_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 16624 bytes
SHA-256: 799e5afd5d1efb9eb56146192b817f8cca3c7963b696367cf8209d709d262777
font_02_sfnt_off000149a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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