Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac68d7603461ac9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 04:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1dd70cd8eb2b7993418f220a390a5c89 SHA-1: ca8bb8ae7ecabc4a52e60c8091d97c9fbf184d4a SHA-256: 2ac68d7603461ac96d8eadfc0006608717d8d242987a10b837e84336b2535aad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dobre-akce.cz/media/files/file/35932761090.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/920f4fa50f7dade1b948f292da2dac99/98112335171.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/42739426206.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/97385771460.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/94275080314.pdfIn PDF document text
    • http://headrepublic.pl/images/files/jirifukexajusolininaki.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b750f4e30fb---42705197491.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/viwoperozamiga.pdfIn PDF document text
    • http://honda-vo.com/upload/file/5827475947.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/32089554902.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/pikodugozimubigakim.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/69784973103.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/57c592a8bc89f2729ec62934fa91bee4/4831188735.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/89405565243.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/kelupirujibapanodozo.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/laruxoguxujewaro.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab32b517197---zexopufifojabarude.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/latupozese.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e529f18e5f3---puvivijeginobojitapemexa.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/fojojoburowuluxosa.pdfIn PDF document text
    • http://renovator.cz/files/file/labutasobenebujemerogok.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090034bdaffb---tizaku.pdfIn PDF document text
    • http://htwy.com/upload/file/piwugorewuxoxu.pdfIn PDF document text
    • http://garderoba.sk/images/_file/624363329.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/vezarusikozadanuwaz.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/nolosurijorasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=basic+division+worksheets+with+picturesPDF 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_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 10960 bytes
SHA-256: 04ef43259dc821b1ff1ec25eabfe9859367da44cdc66ee5dabf6d268fa846344
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 16928 bytes
SHA-256: 9edce5e29561dc9a3d8d764b04a02a22f90e44889a09d035306d9b1abad4b44b
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1