Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf8e34f1d600fbb…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 17:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab8aa6905c30aa3b8e11b7de25dc4e5e SHA-1: dc895b5231464dab5d9b0b69bece3096207a6a53 SHA-256: 7bf8e34f1d600fbbbcec1c7f3b2a2f74716809343bd2ab3dd5c2865a43952f05
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only design and embedded links to external websites. Heuristics indicate it's a link farm on disposable hosting, likely intended to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, suggesting it's a trojan designed for phishing or malware distribution.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=download+prince+of+persia+sands+of+time+for+android PDF link annotation
    • http://ck-buhgalter.ru/userfiles/file/vixofazuxiduminotododeb.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/33619019218.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/bukekizog.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/lorugitibevadijo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136509920ef6---63439578383.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/77108040012.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/worikupadis.pdfIn PDF document text
    • http://sungder.com/upload/lurufepebomorifotubage.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/kusobobodejaziv.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/13348321958.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136e71fbdc13---50584577990.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/39138661837.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613313eaa8f82---kexivomitisawapeseki.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/9566603964.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/91398842044.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2e418d18---26815656448.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/xirewumose.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140da0d2d77b---dozigufimujikavijolej.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142d6b2c4e5f---2940082967.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b97b36af7847b2d984f0b0e78e9f3093/44724316098.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/43128431277.pdfIn PDF document text
    • http://moretonassets.net/userfiles/3348582419.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/masamenivojilazuwonar.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sasudowiwiwojarijabus.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_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 14116 bytes
SHA-256: 04b87ce457d6aad5b825e8a9d96830d8cc2738946a6e4ea3c4d0264e35724ae5
font_01_sfnt_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 10868 bytes
SHA-256: 5b8df402436d731167f6641d9b3d594752af7fe7ce93fd2f80fd4d19ca5fdef6
font_02_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1