Malicious PDF — malware analysis report

Static analysis result for SHA-256 856e7e61845c72d2…

MALICIOUS

PDF

104.3 KB Created: 2021-06-26 01:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e5ee16eeec1d52414fd0d2c8dfc7307 SHA-1: 59e63f7926edde5fec5d44804fdbe5c8d9933af1 SHA-256: 856e7e61845c72d21fdbb96da5142316506523669fda9a5e7c643d971257d0bc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://krisoc.ru/uplcv?utm_term=baby+songs+vhs+1987
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4m4m249k5r6m6m6h6h12pkeugv/wumurukixutuvojenuwex.pdf
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/lobaduvetegokatajarika.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/d369rm8sghgac3fse9mlit3ov0/nadepovab.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b429cfa6f---jilutu.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080299e708e8---zuduponebiv.pdf
    • http://wecans.net/_UploadFile/Images/file/61609241903.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/mld47ccq1d0pq0giqdblkkjqpa/gemepejilufip.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099c23baefce---38383352890.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c38c7a63d01---45673277171.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba852ca72f7---gakugenofa.pdf
    • http://hgbs.de/userfiles/file/rovibemugow.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8i9f1hleq7od971jafci0r2iv7/rejotuzokigezopufoxa.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68d9bdc380---32138686957.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173da32b06---jusek.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/oaq1cg0289t2vq6j28bft8d8l4/83434037216.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5ddcfa336e5f742ba391476da5f9dbe3/74809470504.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b316a65a9c3fc1e1bfecee49f7d851c/26967664597.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/xukaxutu.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1b08873f403bffbbd8e0456a40459ab1/robegulusilexewogak.pdf
    • https://svetplus.com/userfiles/files/73717794717.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc773719b---biwukarefiroju.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a85f9a4cdf426d4aac7d4fe0022109c6/jizixivogagipesekubatixod.pdf
    • http://kruengrangthai.com/files/files/salivadibofomija.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb00d98a91---28515199003.pdf
    • https://kede.org/userfiles/file/83755478942.pdf
    • http://batiment-tunisie.com/userfiles/file/xapeduzow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dfc.bin
ceb77f903fd300e809dc3e27a5de3b26fd267a8bba9f60e02a8a362c134dd1d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 20056 bytes
font_01_sfnt_off000161a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161A6 16792 bytes
font_02_sfnt_off000179bd.bin
1b5d1b16a0f1da0cfd1d899ba283a14372a3b806fdb2508c8b0831ac8bee1d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179BD 10772 bytes

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