Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22a3d1e944a3625…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 20:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e02316d7cd31b51b46c94494538102c SHA-1: a00427ff5f291834b338f0af244cdb0b2ba26dee SHA-256: a22a3d1e944a3625efde3f649feedfb86e4f46addb36e033c9e72f2f23b50abc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://dealershop.es/userfiles/file/43199697615.pdf In PDF document text
    • http://tuanlongland.com/upload/files/8339328124.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/koxaded.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/8631811154.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/rijazakigudoveji.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/64246950103.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/numixatimam.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210905011815.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/61240776311.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/91141484413.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/suzafubisowarimugapegupod.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ue0g14aabdqdoaav355gc38dkv/givepabasoto.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/nixapiwaginaza.pdfIn PDF document text
    • http://datcat.vn/2018/file/bubuguworupewixokaluxo.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/22313245647.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161420b84e62b1---subebunarutuxa.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357dbb0f29d---gifezigewafipinup.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/fezika.pdfIn PDF document text
    • https://coil.hk/upload/files/19441116098.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/55609663348.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/34563961894.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/47030923107.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/86557775192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=my+best+friend%27s+wedding+watch+online+freePDF 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_off0000c6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C3 11120 bytes
SHA-256: e18acc42a19afb50b70addf9a7c6a76d0cd135d503bec134c16ca5d6a5d99433
font_01_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 17372 bytes
SHA-256: 5bf6d302d5f6d0b590b4c93de311f4184e42d7966a11c1c7cb4ddb5189943496