Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35349624fc3d286…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 05:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e530df6f9c8209b0d9a3fd54f26b144b SHA-1: e20396ea918cee088e2e3bc7e56b5e27ad2d8a4b SHA-256: e35349624fc3d2862389252b34b5fe41667d0c57763e70a3e1eb61d17f81f510
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=marathi+movie+download+link PDF link annotation
    • https://hattoco.vn/images/ckeditor/files/jaxugotasi.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/23711284363.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dbdbbdeecadd35e0082f6f6fe3c95f85/nupekunoteruruwavateribe.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161347f2df2b09---zigupuvajudopa.pdfIn PDF document text
    • http://arsvet.ru/img/upload/pezorababojikuwutexok.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d1b6db6d299ebb7d35a2ec1ae17202ed/62008591839.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210912055448.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vepnv8mf2b54nbf0iim42297e1/dukub.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/52643010654.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/zidopixebiribexak.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/43049411808.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ead2478573ee42d2221feb8b44f7b7a5/luzotanurop.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/welafixekikenelapirapix.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/51889648847.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/76084576137.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/fowefibiwirutobegalazuku.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/woloralozamedewomova.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/32818675b5729cd3f013aeb189984ac0/12343373872.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/67639003264.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d43f7ea4a---3460499505.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/41982afe07effec69568e8162d01411b/63481566467.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/wibusutepov.pdfIn PDF document text
    • http://htwy.com/upload/file/mubiketalu.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/dolalawox.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140216eac8c8---10903647928.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631354583jurexutesiv.pdfIn PDF document text
    • 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_off0000b7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 10580 bytes
SHA-256: ff13c60cc840fc24432d871feb7d712a2851cb7ee9bdacc64ec4b31948b0db50
font_02_sfnt_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 16396 bytes
SHA-256: f828019ba41cdeae9b337e3a39ce3d08b083259061254f0c86c22334da262199

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