Malicious PDF — malware analysis report

Static analysis result for SHA-256 322423698332f1fb…

MALICIOUS

PDF

92.0 KB Created: 2021-08-07 21:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0afd917581a7a259474ad075c65cbbc9 SHA-1: cafa110e00d0c5656770f4b4222de5a3f9bd8e7d SHA-256: 322423698332f1fbbe8a607856706c53c054eb7ddfb0735c4da6c97716ec1e22
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains flagged as compromised or disposable, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sh-ruiyangcpa.com/userfiles/file/2021-7///20217312057558072.pdf In PDF document text
    • http://congtyvima.com/images/Download/80134382523.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5baeced7---15085074957.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/26200896318.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lafapunosiluzewes.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/duzolelosazetos.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wijifewowora.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/10586208010.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/32180981427.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210720_29F7DC866E300655.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/92321695954.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af7804a97---zadimajufevizotobedi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/99258841229.pdfIn PDF document text
    • https://esz.jp/img/editor/files/45847999775.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc79e0cccb---sobojafazaxirefapunuxeb.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/35175546727.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/tusazobaludiraxisogamofek.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a384bacee---bizamomapaso.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/vuzanamuzaxak.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/80470092484.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5097297735.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65abeefce---buzufokuwagavutejelow.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/282bf8d585f58709b7cbb6af29735c11/pamafilijunolumavajigof.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/csu55077s1q24p93k9s0347n15/82532712727.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906205099ef---60033961342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ssc+cgl+compound+interest+questions+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 11120 bytes
SHA-256: 2a8379c4ff7fbde344a7b79aa28cfc356c18a686522266a39249d91c7c0a480b
font_02_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off00012cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFF 19160 bytes
SHA-256: 617707dbb86b16232457a8faec36a8af31c1ba64e5f815109bd2bcd269937d1e

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