Malicious PDF — malware analysis report

Static analysis result for SHA-256 b020ec59566c58cd…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 17:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ef916ef304deaa7f60c032dc863688e SHA-1: 577208f1f82284f86870c496fb5e1d20a73a057e SHA-256: b020ec59566c58cd76c01dada9d176d163c17ea6582d3d648f0dc38f10f1e86c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm with numerous external URLs, including those hosted on compromised CMS uploads and disposable domains, suggests a phishing or malware distribution scheme. The document's structure and embedded links are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • 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 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://oniceh.ru/uplcv?utm_term=demon+slayer+infinity+train+kissanime PDF link annotation
    • http://sunway.me/uploads/file/100020242149.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/82870430864.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/10774740641.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9b2800958e3a4eea43feb2e31ad504f4/78281157716.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407ff12d62---7150364796.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909181151.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/nulolesapewulepedovag.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210903132203.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/rimigo.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/fejapiximof.pdfIn PDF document text
    • http://surtek.biz/image/files/20150329_191149.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/lapip.pdfIn PDF document text
    • http://husplaza.hu/editor_up/2440313697.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/95352686240.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/60320697177.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/givavuw.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/zufabinazedori.pdfIn PDF document text
    • http://livestocktool.com/d/files/pamanupeduperogunotera.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/31037641348.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/63013995305.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d2c7921d---zijufekagaz.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/dugikivivunebovukugi.pdfIn PDF document text
    • http://unibox.lv/files/text/lomumolu.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_off0000ae4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4A 10584 bytes
SHA-256: 51ec0ea33ab8410544ce5fa30d7b658b156b957e5accbe60c5dd677b27ad77fd
font_01_sfnt_off0000c676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC676 15620 bytes
SHA-256: a229dec13edc077d0d722b62d7667f27ef633b60f8e0a267e5b14920f985150c
font_02_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1