Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef0b3d512278446…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 15:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1b2f687fc7c1f4c2c3f71d265c189e8 SHA-1: ac45906b8227c61265aef286de1fa6a8aa652a76 SHA-256: aef0b3d5122784460f9b5fea2e3e0cf61e0ee3a682f4dcadec206eb39bf1c44c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The sample also features numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=game+j2me+loader PDF link annotation
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8d6e46de---67197670225.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/letediv.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/zovov.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/xenarivi.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/80751184268.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9a5c7031a---60008331708.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zakuvugudifusolakupopur.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/16859418096.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/ligejusawumigugidiluza.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/fijoxizudimadejuxetajol.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/26422985394.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/jugazuziji.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/50209957177.pdfIn PDF document text
    • https://gitimohammadilakhimpur.org/ckfinder/userfiles/files/penikilod.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/lujuromisos.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/paviwarimojofokelowojovas.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jamakebukefamibewaba.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/jilos.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/powudejojifu.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/97872221577.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/86180077867.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614d68c629e25---16132436141.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35b371696---sabapepuko.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/71748624310.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_off0000b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 14424 bytes
SHA-256: 81d9038e07cdfb8ec56a2cb6123a7f76c1bb3fb284e34e47d0309b29e7605fe2
font_01_sfnt_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 10236 bytes
SHA-256: e82be8714d6c6d3f967aac80630e38c0ac95a0c8815c38221c74a41129975e60
font_02_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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