Malicious PDF — malware analysis report

Static analysis result for SHA-256 f957d9aec6aab9ce…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 01:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eecf8d3611499b6024000d98bb34b00a SHA-1: 9dde387548ecfbc4d1da1cd438373cd74b15dd0f SHA-256: f957d9aec6aab9ce22dd656587cd8e391ffb79ab90d792d1a784062e80112007
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'sirius android apk' in one URL suggests a potential targeting of Android users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://poketomecam.com/uploads/files/torilosofilo.pdf In PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dukoxisadisuberaka.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/vuxafotet.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2fc04e2ca---vedosesenazerulewe.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/64318463021.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/2831732446.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/jolutadizareg.pdfIn PDF document text
    • http://epmachine.ru/d/files/nipugomovamojakibasoxe.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/2218277224.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/zowalabamexonadow.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161384f38e822e---zivewolusupuke.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/kufokexa.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/042c7643f87768364febf63245210fde/wofopil.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/58058379518.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/kujonarene.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/bepowikanafijobube.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/31959372933.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/54835933112.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/nijurerozirexe.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/verimawejedumufejigised.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/doroxiw.pdfIn PDF document text
    • http://bienbao.org/uploads/files/21112939841.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/21754277476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sirius+android+apkPDF 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_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 19084 bytes
SHA-256: e156496a3cee137b2b4883bb4a201c6bc7f1243d54efc6334b628eb3113bbc80
font_02_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 10376 bytes
SHA-256: aa090b83e6f23783c7a8d78028350a7c85b38139ea513cbb865893b457e5f28b