Malicious PDF — malware analysis report

Static analysis result for SHA-256 493b5dce1453f92c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-03 22:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 259ee59953d497667e63bbc51d79a6e0 SHA-1: 325183a91ebad30bb8db28ea4ae6fd07d2a7c2af SHA-256: 493b5dce1453f92cb3fecd75f385f8e31f40daf0d1e6e14af8242ed20c41cdad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan. The primary attack pattern involves exploiting user trust through a seemingly innocuous document to lead them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://extintoresorigen.com/images/editor/puguwujuremew.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b52be1497---8626457755.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/snq5pgvopgn55rgb0h41050st3/loxinazuwebifofewipepeb.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210606_034537.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bd7b3c1e3---derupezepebomoda.pdfIn PDF document text
    • http://www.asslar.de/downloads/bawixuzej.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/31073336835.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3e56e64bfd2e63cd7ac14bffbf7e3893/83584669144.pdfIn PDF document text
    • http://vswet.ru/f/moxuzeboloxajazo.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/loruxeroworofelimaxita.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/28634223494.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe0d5f40b7---32271293726.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ea3aa2955ef6083b1918362ad8760fc8/kowinenegilan.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/benugaxemenomefow.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec9905e5fd---28870247171.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8fe3a46dc---wuluzerivedelitadasurajiv.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/gudezed.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1063638927611e51931dab6.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/9407555958.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/giwiwunirabediwer.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/zidoruza.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/69f10f03b5cfc0dc882ba0696777c9e8/17035826767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=anemia+cronica+pediatria+pdfPDF link annotation
    • 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_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 10548 bytes
SHA-256: a8eb0826fe4fdb374d608191a6be0dec2d41f39a85ae0ca759bf02656f51d5a7
font_01_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 18656 bytes
SHA-256: a4265e7abd3303796e8226a6e101b75f632def79e604647ef5d96ff50dfdfa31
font_02_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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