Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87d06b00a8dac8a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 22:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb5f3ecdc145b24eb98a5b7fb1fc97ba SHA-1: ba8f22832f06c58a80aa0c94abfa0608aecacbf0 SHA-256: e87d06b00a8dac8a8300fc2d1ef4f5c66a834e3108be3ff7304bde70cadaf399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms suggests the PDF is used to redirect users to potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=simply+piano+midi+android PDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dbda66d5a---wojubikiburanupe.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140128a2c506---mosevanumifitonalunaxugo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f1fd2359df22a6ac77751d777dea28c9/xurinelivolisituvi.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/14742502388.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/bagaregamof.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/36773158164.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/1425520968.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630572693.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/tepuvugetezedugoxoluwakan.pdfIn PDF document text
    • https://hse.tw/upload/file/sogilaxoxojifejuvoxurores.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/18443175324.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/89110215356.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613628edafada---volekitizozugomivizamefe.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210918191106.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/komuzubigus.pdfIn PDF document text
    • https://atavio.ru/files/file/97397587554.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/tonetagesebuz.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911121558815574.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bivujumoreko.pdfIn PDF document text
    • https://suruburi.net/mm/file/vogofedajabenavonev.pdfIn PDF document text
    • https://brakos.it/file/74496567327.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/15351285481.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/vibedod.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/82740927238.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/70335858414.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_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 17992 bytes
SHA-256: 7122ad28d9a7c65965644bf02aeca12eccecf48d13e713f33d0bee7115bff463
font_01_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 10344 bytes
SHA-256: 98df65d3ef9509003bcb1d6c1329327cc1759689c37ae1cb941e92e47919bd1a
font_02_sfnt_off00012c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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