Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a144d4ad44783f0…

MALICIOUS

PDF

77.5 KB Created: 2021-09-30 10:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbbbbf9f9ed14a0751ae595c41c7880c SHA-1: bcf9fffa93b1e6b3f22481c8a36aa8f50576c6ef SHA-256: 3a144d4ad44783f0f1d6736f71d3afd47a59281e62ba28f2225d8ee14dfefba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is a PDF containing numerous links to other PDF files hosted on compromised WordPress sites and other disposable domains. This pattern suggests a link farm designed to manipulate search engine rankings or to lure users into downloading potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or malware distribution lure.

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://coretry.ru/uplcv?utm_term=download+powerboat+racing+3d+mod+apk PDF link annotation
    • https://mekongtransport.com/upload/userfiles/files/70104088294.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/zusubagelibawadakida.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/pevitumapagolex.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/makupalene.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/52589509825.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/webofedurax.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/nivegibe.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161539b7fc7d39---60253129573.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/nuverarajuzotet.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/34668061687.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210911140522529.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/narapuvazugazinizexezef.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/43928752307.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2abe19tungtp3rjtnnqosqkf24/vijijixuvesamelijidib.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/tonazulon.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/falonobagepezefo.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/guzaxemimisemip.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pegilelodasidizut.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/jofosojivanupedu.pdfIn PDF document text
    • https://best-label.com/upload/files/43785809050.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/kobakamewufosipuribib.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7accb9829---besafevexule.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/wenokupofonewube.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_off0000bfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAD 11180 bytes
SHA-256: de93c7fa80c79e26a6bb2952a73552f58a271c80071f9c255643b3fe300a7924
font_01_sfnt_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 20008 bytes
SHA-256: 7cf5d6d1501dd51732f9dc9fd4317ef2592a309f5fa2dc618148328679cba3bf
font_02_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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