Malicious PDF — malware analysis report

Static analysis result for SHA-256 12039fe73aa1ad6d…

MALICIOUS

PDF

72.7 KB Created: 2021-10-01 11:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d110d0a6c52a927f6acd495d0ec2176f SHA-1: 1f25a40c95bf683c3f5692e907ab80c0a3c1e37c SHA-256: 12039fe73aa1ad6d8b943e279a753e030a2bbfc26362f47e7dd3f09e68c64243
176 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate it's likely part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=yify+app+apk PDF link annotation
    • http://exim5.hu/_user/file/jipakusago.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/94186768950.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/zavov.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/55509537895.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/damivinofotofobute.pdfPDF link annotation
    • http://ambvetfanini.eu/userfiles/files/kodid.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/toninobape.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d39a0e11a1ea6d00829a7599ffd081ae/92678698712.pdfIn PDF document text
    • https://dm288.com/slicice/file/60915860048.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/mebubovanagaraz.pdfIn PDF document text
    • https://ismart99.net/upload/files/69454589098.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/52668670841.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/60288316694.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/1702005814.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/nuvinotanalunegotovudupuz.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/bitavugudiz.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/kurujidogufoximivilaxar.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/4141094613.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/89570125512.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210904_E1BC608C946CA56F.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1544ed05---ratofif.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/sagulofigibigulux.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2ebjen7ngcdtlj71v1qpqobo83/bawazovomapex.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/mewuvam.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_off0000b697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 19456 bytes
SHA-256: 1f7efe4d39c51209929db488e3b348279cacc27219f7f5cd0d6c3e1afcf12e6c
font_02_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 9772 bytes
SHA-256: 030424324daebfdd9ab66f7451df53ad08ed8b871a21ced09c487e9a27a17011