Malicious PDF — malware analysis report

Static analysis result for SHA-256 82075bab6a686fbd…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 09:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0a03aaff19b4575566fabab4d933a492 SHA-1: a1c03bd74cb7ae525649df1573eb17b7a1be1a65 SHA-256: 82075bab6a686fbd70d2e17d994ec74bc6962d2e22795e202e0dd787efdf1b48
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=disobedience+movie+online+free PDF link annotation
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/972df4a014756b226df42f8f3ca306a1/sexenuk.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138e139c0afd---rigesimujunuruninu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9624ac533---72902681018.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/35306996427.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/dakavajexusujifawiwewuv.pdfIn PDF document text
    • http://newcityhk.com/userfiles/rixegilujebenalexo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/13747794043.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/92287476574.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210904040017196.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210915105948.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/bujakopikedaxerepudarem.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/28678811565.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/koritegib.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/jizejib.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/bugibevuxeduvum.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/kupotogagexuburixuroj.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/35567108009.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/87563816559.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/33035682536.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/70969414126.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/paxitesamuwejitetovomar.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613727ed811a7---gexotavuti.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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 17188 bytes
SHA-256: 0461b7579ad13c53d4f412adc5d23df7482f67e0172f884d6a6dd716633a16fe
font_01_sfnt_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 10584 bytes
SHA-256: ff494db276ab14fa7c8f0f2049d79d2ef74158bbe014e66cfb62aac4c53dfc21