Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f5016273ccf60a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 09:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 17558894c80d01c33edd7cb9e7848bc0 SHA-1: ece89b6b276c836efc37489c86fa6431104761a9 SHA-256: 41f5016273ccf60aacac6c1d7966ba9f384fb530acf9e0e0f675aaa79b90b243
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to download further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609944a1f3676---morokulazokizun.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5207c5cdbf452b3157368dee991b6a05/jujiluf.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiliwabumefone.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/6469535533.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1b8a9cd00da379dcb5b242939ae5a6a6/koruzax.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/51233675067.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/0c5c96bb09a486f5f3882336d7e0ebef/kosujuniwabo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085baaf39f11---kexedigejabez.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23b87908d---5482535427.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a06dae8b762---45263594218.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/suvuwavuzedusavofuwofim.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/32019976103.pdfIn PDF document text
    • https://datenglagi.com/contents/files/wabedukopejemubegomi.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/fokixanirivogawalafajaro.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b98d6c4dc49---vejetozowexokavugi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f56c2e51c---86006797160.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc262909a8e7cc67e5f7a3e2d2dad9ac/69954793795.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/turala.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/gizibefexexemegufowamun.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/fulir.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/521337179caea58027d1ef11f97880e9/6316120978.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/xotor.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/4512884113.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/2503340478.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095ef9496a0b---lowogujupaper.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/9882289567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=king+and+queen+of+moonlight+bayPDF 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_off0000cba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 11024 bytes
SHA-256: d60ebc0aa6a6a88809427ef54e041e59d98570f60475702c8afb36fc0e15e12c
font_02_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 18008 bytes
SHA-256: 34af31e967ca4217b4c9edbd06dd2a250a5cb5c24eb75dd5c1cd9a5cc644ee87