Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f02050da9d8257…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 21:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3eabfe70d2f2d86bffe80cf82ccd7f4a SHA-1: 14af024f4d579e7daac339228f07c7dbe342de64 SHA-256: b1f02050da9d82570427a2f0022353ec9571d72cc7455268dd812ff3783ef36a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

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://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/777211500.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9536b93f182ffc9156c0b231c2af3d99/rapipaxawupupojebi.pdf
    • http://sb-78.ru/files/file/70905375178.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/207ba77db43fdf810a89b95b36f1b5d7/bunurorisabaviku.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b43b07a0905b28f51166d388df07409e/22548442890.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/95242424302.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/67434424464.pdf
    • https://srmhomes.com/images/bulk_images/files/sofebovuzasezoge.pdf
    • http://namlinhchivietnam.net/userfiles/image/file/65060118945.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kqr8q3bu0hhv83fdbhljleqre8/90343406778.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/e4d1sh1csjqkjj14arab935ibm/xubopiwelekifa.pdf
    • http://zzquansu.cn/d/files/39532493871.pdf
    • http://presssimayeshahr.ir/pic/file/dufozegalezusoripanujerex.pdf
    • http://edituj.cz/res/file/pozam.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/399d08071c728d4544a380e24b693062/27504855497.pdf
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/30855901238.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070896702458---jemulosu.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5f004764448cadd3ee27094467b321f2/kefosifovipaxivazexosu.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4683472fdf1830c3d669c1f62b85aee8/fibini.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086e124849fc---95541895426.pdf
    • https://slezanie.eu/userfiles/file/78451683308.pdf
    • https://mfdesign.hu/files/file/91415682918.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/76347563814.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=skeletal+system+worksheet+label+the+following+diagram
    • 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_off0000e0db.bin
f211e6ca338909b257995c3e25c9fdc850eb6c8f138e96e74a71d26db8441cad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 16608 bytes
font_01_sfnt_off00010b72.bin
3dc0ba41549acfaeea92f08958124eff3c44167ba8f832394f5657908750e8d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 11308 bytes
font_02_sfnt_off000125b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 16792 bytes