Malicious PDF — malware analysis report

Static analysis result for SHA-256 47449d38888522a2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 08:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33cbee6481634d6388d79008ae9f694a SHA-1: 991f5e7d2d45243ea75fad34057b3310f4f4bd14 SHA-256: 47449d38888522a21d9b76fc27b6437e043e5ed19eb5bc656d25791c745dd88c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised WordPress upload directories, forming a link farm. Embedded JavaScript was also detected, suggesting the potential for further malicious actions like downloading additional payloads or redirecting the user. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://archism.ru/uplcv?utm_term=swami+sivananda+yoga+asanas+pdf PDF link annotation
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16118df7964d6b---83811886328.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/wosajap.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a7fab7b34---wujizuvuzawatazemege.pdfIn PDF document text
    • http://canoeing.by/pics/files/fifizamunif.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c3781132c0f---zisatagukaveku.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5407e2ba58---savexufafejakedevepugiti.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/57224974667.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adedfa649b4---werukilofilomamezep.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/sinonovujadelumetimixejad.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/jibutulalijunabevekum.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/retisug.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/pexasi.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/nutovifakonefine.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/valekanitupebum.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/gezajemigugetowanav.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/cajkpmh6kkg152dtr6o5hgp4tc/vefuvidafek.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/nizikujes.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c082c97de6---wajalapikukigi.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/bitinosovukojotikiwilisat.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/morufajofedovulenimazige.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41446b3a7---pudisurup.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210809_9C7D09F36F372963.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/4861812953.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15de28e017---remifijalezoropi.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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 18160 bytes
SHA-256: ad2e943f405803d0c5712e30257922896fae729c0d0ffd5073db0509f87e0abf
font_01_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 10808 bytes
SHA-256: 3d2402b0cd9f0a76e0a6b49f16b9400dc0bc8dd21b6d96ea57f88ae1598c3dde
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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