Malicious PDF — malware analysis report

Static analysis result for SHA-256 e192ee166a5b6c8e…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 05:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e3d9991371ff29cd9a1bb9f06baf2e46 SHA-1: a157226f4ffc6dba0a5817223467f6d8a0296b3f SHA-256: e192ee166a5b6c8e9c072610c53ed14f6b674ec9683fa245dd6777f5b72a513e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were extracted, the presence of numerous unknown URLs strongly suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608199d48a3d2---72446131792.pdf In PDF document text
    • https://dolmalatrek.com/userfiles/file/75830051286.pdfIn PDF document text
    • http://atek-ent.com/upload/file/52553876226.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8777d27bdbbc0b35cfeb0be6c3564695/xufolikarujobepefisij.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/zupexavobip.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ab2c0e916ffdf4701ea316741f3e409a/32272178103.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/33924990222.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/romonoso.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/xanukazibugufi.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1626360571regurufepala.pdfIn PDF document text
    • http://sieuthibds.net/images/files/82032549181.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607934f930db3---67350682847.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089978f607e9---16192970180.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb67da47b3---tisukoxixamerisovugabi.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xobevuwadupesuwub.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/41837393644.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/mevuzepabazekibawesigot.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210809172457798363y706mz9ujss3.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/789257757.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/zagogimonenag.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/jutod.pdfIn PDF document text
    • http://learningkey.org/userfiles/lugodimuxagetux.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/18374379676.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/40152971457.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2b93be5e17a6017f63489885ca87118/vazegudafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=u1+bus+timetable+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_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 10636 bytes
SHA-256: 80139850c55faeebcabc2a8445f814796810ad7a2e3ff1976dd945c40d22eb72
font_02_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 17520 bytes
SHA-256: edffbfd0de1a302305e89679b251857989f7a24e13e6d50b1f10d64ed5d0951a