Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b6c2756b59700d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-24 09:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9443b399f13a6b6f49d21b91aa0f27af SHA-1: 99027d22b8425e8864f7b1971a0a2fb3040229b3 SHA-256: 90b6c2756b59700d8acd54e5d01aafd2672bb5c332cc2d0ec3bfae3da47f8858
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=las+mejores+tiendas+de+aplicaciones+para+android PDF link annotation
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ed801a5fc2f478c485450f8c5bb1be52/mowazigegitesagozotozem.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/38280819403.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/12633255198.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/47911342176.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/sesoxasipifex.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/72269394345.pdfIn PDF document text
    • http://appextskihjthj.handylover.com/upload/files/99798511304.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/pozemob.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/96681992001.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/temizebudinetad.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kulewudulemetabinas.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/9884569793.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8iu9fgd253t3jalm06c1t8g02r/24120948154.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/56901854308.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/36556068801.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/58142317650.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xopijogikuxejejuzixuvemaz.pdfIn PDF document text
    • http://chipgene.com/image/files/20210911_050435.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/kiwikebut.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/feganewanizijosujegalol.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad17c3f485---lasataxavogo.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/jelezezimiduwazuvuwupe.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109201826512833.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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 17560 bytes
SHA-256: d49cbd8f6b95a024cc18d792d03df2787a7fd827ae44c352ccb5e4a3ba01ab78
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 10760 bytes
SHA-256: 172ed69dd22791f7293478e4a354fd13fdf5745f1534830011d1537c45a77b2e