Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e9f81633f92d7b…

MALICIOUS

PDF

86.1 KB Created: 2021-08-13 17:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44fbf24ae021d01b03b7e1fe03cffbc3 SHA-1: 1aec8130d494cde6005069aa4f9808ef6c824723 SHA-256: 71e9f81633f92d7b3478fa52427d347def3bfbfc080d5c3249dd0e582700b313
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm hosted on compromised WordPress sites. The presence of multiple URLs, some pointing to potentially compromised CMS uploads, suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1bda477ce---xexasukixenekidus.pdf In PDF document text
    • http://elskup.pl/images/assets/file/89923026082.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/2569263340.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/xaburotunirifitobajirewu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109a93ba4bf0.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/8225780998.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/85416043885.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/96706662991.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ra7bbamrq7h3v1u4cghdvftuid/puriwavuvomiti.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d5a85cb4037c8a457664f8dfcabb0b79/naginobebajavusaroxeno.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f204d6beecba68f09db760022df1bfd2/dadewonomipigak.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d923008551---77726165069.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087e92b66546---16434618465.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/630a4a7b3b85ac0a8ac3225c52353f78/pimet.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/crdd60o9p8parjml5cah593nj4/dewapubasopusomug.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/19525251499.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/rasozipijedelabimako.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/mixuxekuserud.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/vunuruxuwiloti.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/24205548784.pdfIn PDF document text
    • https://lesura.net/userfiles/file/nanifisoxinivekem.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/dekesowowizin.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/91209438251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+put+background+music+on+zoomPDF 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_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 11216 bytes
SHA-256: b8582950317daad5fcc2cb50e4fdae464a6c2ed7373012601eb3061ebd344842
font_02_sfnt_off00011cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBA 16868 bytes
SHA-256: e6e53a37bc547751014129c375d6ee649440be5268f99fc9cdf67af7223cf9ff

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