Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf99f4a766e5de2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 15:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4e856095150d8395d8709d9ff9e409f SHA-1: da98a1ca618525d481abc2f64040d0553305f24a SHA-256: caf99f4a766e5de2541593315bd9a55c495467c48cd5eef85c04bc5c30503830
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links suggests a redirection scheme, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://myphi.biz/nbloom/fckuploads/file/xazimamejalenodonimim.pdf In PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c7f56337ff453446f9d67bdc50349f99/36464975340.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608201ef7fc2c---zaxederam.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tepeperir.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2abfe9de33fc28bf88a03d0152ba7f1c/giguritowifag.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dddd991960d1a512d497711786165f86/87065828190.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/53518378155.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/7424458397.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/togufenugaler.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097f89e45d73---jujatopawegadonamomivatil.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///6553271447.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zonutiboviso.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231e34a785---82684357205.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/bogigoxur.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/lalizebilo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17d0d3d35---26826251163.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/h5l6qkmk9cle8rp6esnk08ve91/nobekix.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/75513214163.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cc3a9e93---wimajejukepu.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/92580864327.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/35637535fe3eea2b8db8092679f7a73f/35027945951.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a403ef81f78---19147255400.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610739d4b097b---21394134531.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/72562650869.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7895cd543fbab47dacb357034ca55424/vubepobafamibiwero.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/52730045956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=top+llm+personal+statement+sample+pdfPDF 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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 10528 bytes
SHA-256: a29f60efc22e1d8dc5defcb208ade08dc8906a58fe27ea2de724ffcfac9d0bad
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 18128 bytes
SHA-256: 4b55f40ea0a618bdda45005ebe777581ac98c910f5f313a66d6d101e5bc65083
font_02_sfnt_off00012e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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