Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2de091ff6e3970d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 17:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 653c9941782e3707f30510c79c1ff24e SHA-1: 75ee2c727745c2b1188399b6977cb3ec5190016a SHA-256: f2de091ff6e3970d912c74a0a0924948083a02a20de4eeddbf943beadf1855c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tottazo.com/userfiles/file/57291127153.pdf In PDF document text
    • http://beccaro.it/userfiles/files/13913085523.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/mojexibovazudafawes.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/8832284346138769eaeb05.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/kisekoxuj.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/xozavuvoxoburaja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc886e793---lesijad.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/59882843386.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/61000387211.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/darujogelogewixatop.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/loxoxafove.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/tevunosobegufiti.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/78383447999.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906073002.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/frhkafmi8ijg97thdaj7k8haib/51217970197.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/54275288354.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/65410555210.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/5713665783.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/52525524014.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/kejuzufomabudusonivugu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c3118d21c3c4856a922362a0a790b6c2/pozegaxewi.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210901135946.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134face548ad---vikakexekefifex.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/fikasekave.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gavud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pdfbox+extract+text+fontPDF 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_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 10408 bytes
SHA-256: adbbf0722561b8a48643e8a0b4337da3edc98cb75f2e73cd205c24e38dba12f8
font_01_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 17484 bytes
SHA-256: 0843cbdc774abefba9ff7ba73159c5f8b180f901c94e7545be206b6c88a0fbff
font_02_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1