Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b709ef5f89757b…

MALICIOUS

PDF

90.5 KB Created: 2021-07-25 20:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 540b0fba420e24408040b231a1088cfa SHA-1: 4c0ea53f9fde134fd0ebc340064d1843f4d0efa6 SHA-256: 89b709ef5f89757b4b59b72423c415b30e4e9127c01a569e9a1683a3fe777b05
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608345d947135---56827016512.pdf
    • http://clubesquilacoma.com/uploads/files/58096188947.pdf
    • http://palami.by/images/file/taruledefunivujediloga.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae719a9fe80---47869733539.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34f8e6185---lakunowowupakexogerobal.pdf
    • http://teplo76.ru/uploads/file/91632525199.pdf
    • http://tianfonmm.com/d/files/mepenunusefutumuma.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/92fiq36jq7cq66jc0871cljkk4/jebevil.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4c8717065207273a0fc65ee95aa24e78/25407902612.pdf
    • http://dokumsuzgec.com/userfiles/files/85211775284.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ef09a5894950d1097f856fc02d2ef0eb/24026670290.pdf
    • http://noospc.ru/SITE/files/editor/file/wesofu.pdf
    • http://beergolfers.com/blog/images/file/90760816785.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b32dcd0ed202a97d5025e246e5796c52/18899756000.pdf
    • http://divapharma.com/uploaded/file/9211763368.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210602020613.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/fd872d71011528e8d823ad314e47ec07/88713748280.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc963c899---lupizixiwejoliledipi.pdf
    • https://jordan.si/dokumenti/file/62564905000.pdf
    • http://pincailight.com/zk/UploadFile/file/2021070409571973499.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/527090cb683c6d08bbdcdc2df9d6c0b2/60118556744.pdf
    • http://szao-spb.ru/images/news/file/98276043230.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/71e6c03a37e1c7a8fe5fa37fc56ba831/bididada.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/88148427652.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pci+simple+communications+controller+hp+compaq+dc5800
    • 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_off0000f931.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 16792 bytes
font_01_sfnt_off00011148.bin
f64d8725050d07b3ef5873849f950f87216a854cf1deea0d60becef55af22d4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 11492 bytes
font_02_sfnt_off00012c11.bin
0169242e02e1f39a123f2f28f22987d3c580a3ae26985f79e53330d5c89f860f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C11 17732 bytes