Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db22d8f4afcab06…

MALICIOUS

PDF

78.8 KB Created: 2021-08-31 05:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 724ca5be5e17e55f8f9ae61c39984cd2 SHA-1: 74b911c31392459692ebca96a38960ba1bd0c756 SHA-256: 1db22d8f4afcab06d7ee666b461d5d9b3a0077488c7ff7e223b937760a3fdba1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://haiphongcontest.com/images/files/sajonirutoxabegaxo.pdf In PDF document text
    • https://tenfci.org/userfiles/file/34431349398.pdfIn PDF document text
    • https://norservis.com/files/files/4794146941.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1d705fecb---13795132592.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/vorijizamewoguviku.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/70063383565.pdfIn PDF document text
    • http://imi.vc/upload/files/57929117391.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c1522f9baa527d2219a7bce989bac538/zavadeledibo.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/40194636159.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/domikilazabozanixaleguv.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/44155269574.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210703122753480.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/50803565418.pdfIn PDF document text
    • http://pronobile.de/catalog/file/65547955228.pdfIn PDF document text
    • https://kede.org/userfiles/file/45489235312.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/16549831715.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/zijaxalidopabaweripeze.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/72280881658.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/19134659859.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/n06ogsvicbg8vg8krrda1d09ig/35383888782.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/27182954212.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/71d9f1542e077e076a391148f9dd6bd2/xulidu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/e0267pj29919sn55721eb1us17/wapoxelororo.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f67e61d8344a0638c4811896b982043a/89726989793.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/5445370294.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/90097703889.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/xaxibimuwukiwigupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=case+and+vbaPDF 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_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 18028 bytes
SHA-256: 42dcbb25bad1d5f06aeb4d1ec6761bc7e2af70ccb939f69d228063f2f73d6b57
font_01_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 10024 bytes
SHA-256: d95c093fcf1b11b21e40e8fb6ae840d1b67663e47032f5825457538c88c13eaa
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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