Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a709fca744361b2…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 03:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3707c4c49524ddb502f7984c166b581a SHA-1: b9c65c936858f7cb7dc0c4c1d153d334759dfecd SHA-256: 9a709fca744361b248de6fcaf037a13d45b1ad89ea3af53abeddb44a70ffcf38
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 or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the PDF's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=ar+android+studio PDF link annotation
    • https://orcasproje.com/userfiles/file/88213149047.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ok0uihvm6eu00k045nqbcsdlq3/polaromubemejinafuripe.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/90650215406.pdfIn PDF document text
    • http://rilta.net/userfiles/files/53604495669.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/93290779093.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/jidafifa.pdfIn PDF document text
    • https://basisnomor.com/contents/files/xozemolonolonoborema.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/kosebopazujes.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-10/images/files/62679523070.pdfIn PDF document text
    • https://aaaxxion.info/images/file/gemosixuraduxanidi.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/nufofedoberuwal.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324a3d7d9d0---88537934986.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jvsvj47l1vdd2ui5hdlgaqm4s0/bodofexovapukukenifopa.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/zewakomavevozezixaxeb.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/33228662370.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/pevanotugejaxux.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad234d8ae---xasitipitifasoponirekimu.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/musepabokigizalizitij.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/bujuximimazojelababi.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/31354247626.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/penadibedida.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/94421499322.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/59485848772.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_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 18012 bytes
SHA-256: ae6e08d0bf1e8eba0014503bf6510ad3294569770f72cd2251b678d83647fa48
font_01_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 10144 bytes
SHA-256: f9fe6d6aacc0ae6215354b1229dbccc62c48b3ac1105c479a3e6b02864499522
font_02_sfnt_off0001340c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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