Malicious PDF — malware analysis report

Static analysis result for SHA-256 0723d9b0fbd86793…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 14:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64bbf5e2d6e8e157185e7edc5c60e589 SHA-1: 1189808f282c045d0fee768bd83e163c427d80af SHA-256: 0723d9b0fbd8679335f3653da51325084e80a24944437e4a96e6912b65e30696
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised or disposable domains. This pattern suggests the document is designed to lure users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=franny+and+zooey+full+text PDF link annotation
    • http://hndgyl.com/v15/Upload/file/20219121148598918.pdfIn PDF document text
    • http://lulanjina.net/upload/files/zetorudajimumubogotuvokid.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kemokonefuvavojivukawuwom.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161336c6e8967b---99422751503.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0f0d6b53---lemaxunutizidasefokagu.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-14/20210914141419926086.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/kinid.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/xiwabewiroloxuv.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/75308126003.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/vibibawosaxanusivojuta.pdfIn PDF document text
    • http://gaudi.tw/upload/file/12993119550.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/23875861616.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/wipafelame.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/71412058715.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/babowerusodoxebo.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wagapufola.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/kugumenufobilumi.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/sumaretusobosatelabemamez.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133c44a147fa---pujamakemew.pdfIn PDF document text
    • http://holzweiss.at/31583487107.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zuratuwepet.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/turejutaw.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/93352775800.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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 17540 bytes
SHA-256: 3644bd2a4811701cf687b6e6d4ed0dbbee22447e66f7f77d545f611854744b54
font_02_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 10440 bytes
SHA-256: d7b5e89ff508fb8acd4133c0111ae3faa9fb6f882a5070263f21c886cc604297