Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d489dd27975115…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 08:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f47b01656ed977523f4a0a167093a3a SHA-1: f8a525579b31d640b28d340fad0571d3268d1924 SHA-256: c7d489dd27975115076052c8f84922be8ac2813cd132e90b825e681bf234aa72
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The PDF structure and embedded links strongly suggest a phishing or SEO spamming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://dbmotorbrokers.com/userfiles/file/60790710381.pdf In PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/10294519132.pdfIn PDF document text
    • https://peterdegendt.be/file/wiwul.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/wobixum.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/65543491123.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ce0c7c519e7b6a51eee20c8a24099e71/fiviladotekadimaxaxikuta.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/60106132879.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/69326870750.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/nularerawigokopirufezenus.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/xulitavivabimugifofumop.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/tefeb.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16143c20729d48---goton.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bd36ec635bd937d07c1d0b33b96a2929/lajinoniseropajodigi.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sulabavivazivepixotiluke.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e9f9d5667---50849683555.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/61605958865.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/20519099.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/58342276833.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/senumodomivuxewawe.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210911000434.pdfIn PDF document text
    • http://protok.pro/upload/files/38108460601.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/pojizitenot.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/nerezofilusa.pdfIn PDF document text
    • http://dakov.hu/_user/file/47404620242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=atomic+radius+of+nPDF 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_off0000ae98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE98 14552 bytes
SHA-256: 7bf732352cae462edbf6969e1ed67f446465f6aa838c6eb941c51856a41bceac
font_01_sfnt_off0000d330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD330 10540 bytes
SHA-256: 9bf6e5c684844159c474dc853d01dd0df029d4469f2162019e6f13f8fa9b0d26
font_02_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1