Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a9940d4e5514df…

MALICIOUS

PDF

72.1 KB Created: 2021-09-30 17:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2aea04075d50af0ddfca530d4287ac7 SHA-1: 98b3f61fd8fff4e855cffd47e7d442b5e6c6436c SHA-256: f2a9940d4e5514df1377f95b8851ea739ee7ea3dbbb711c98f9d7af002edffc5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically suggests that some of these links point to compromised WordPress upload storage, increasing the risk of users downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.icf-plant.com/files/file/91077927595.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf80b461ff---84256747173.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_24_07_20_52_5932.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/labijikenes.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/27805228022.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/42473964808.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/mazatiluwipijimizasejo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf665bb1d9---fepemexomonekilabu.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/xorozetovajidejev.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/12310176523.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/84307799697.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/77158398820.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/38e791ba05f8278f7f87b0b6c8bfc6cc/69374497134.pdfIn PDF document text
    • https://buyafranchise.org/files/files/59194172779.pdfIn PDF document text
    • http://koutingchina.com/upload/files/jajubaxesofugu.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/12974915713.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/68037083312.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///zoxilomisilokebi.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/gojipirizedovolaz.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/bisejetazuvefel.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/gonewejerazuvovawofop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=heroes+lore+zero+apkPDF 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_off0000af90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF90 19940 bytes
SHA-256: 48162364370880ca20eb9a4fb178d70c4ab550e71e1e7b3ceea7ce3b4f454e21
font_01_sfnt_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 10096 bytes
SHA-256: dfb44e4a00b08359dea5a915cb565a2303256979b3d39b16289f9d9f8f6021de