Malicious PDF — malware analysis report

Static analysis result for SHA-256 9885b1283de0ef28…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 17:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7b080eb2fd0e0bb44ac753109bf9838f SHA-1: 15e036a7c066de067bc0ddb4eeddc88ccb76eb93 SHA-256: 9885b1283de0ef284231092ca1c7a6689a4d99aade5320cf66f44ff83e821ed9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb684e8e3---69731794855.pdf In PDF document text
    • https://uat-tunisia.com/userfiles/file/91968162722.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/sidubonid.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/lexataxifibi.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/zekefafesisagu.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/215e897159152e2f97e60e49f735acb7/86508162803.pdfIn PDF document text
    • http://tano-cable.com/d/files/dikejibekisaxisiga.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/jajusemawu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/thr32qrj0nilgg6dstfgjkt0kc/57357530641.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3608e6e97---vorusogipexizevotuwajobax.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/reginekunol.pdfIn PDF document text
    • http://pasted-radio.de/web/files/45475105207.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/72149946576.pdfIn PDF document text
    • http://jarosi.hu/files/file/megidivanolutididipog.pdfIn PDF document text
    • http://hainfelderteich.at/duragonewexuvonapoduxi.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e43ed334142141dc90e484638d203478/62299856579.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/27211989495.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160707b6139a18---nexogavigovavaviwij.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/30053161435.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/jusegaxevipugoruteriv.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa63b00b2---biwifadaramosapusagupasi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/097cd9ab932d18529378356db50fc413/25771884595.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/pugejafag.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092537a13fc4---vamuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=invalid+cast+to+abstract+class+type+c%2B%2BPDF 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_off0000cec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 18012 bytes
SHA-256: 53c017f7202bd743b6e137add8ef2501e398c1edffd2324e83ffab9f3d3a799f
font_01_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 10780 bytes
SHA-256: 2fcbaf516169f671e36a9f77cd0b0b983f8c03a28b009691acced13a5f49a0c6
font_02_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1