Malicious PDF — malware analysis report

Static analysis result for SHA-256 555b70cfa15715d9…

MALICIOUS

PDF

86.6 KB Created: 2021-07-03 12:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b833c2def7a8f95ff6a060b86fe90edf SHA-1: 564d364475511235fd715ccbfe3dbe695fca2453 SHA-256: 555b70cfa15715d90fe26d879863df650976d67f035fcafc026867bb428e26be
236 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious Link T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to potentially compromised WordPress upload storage and disposable hosting, suggesting a link farm or phishing lure. The document also employs social engineering tactics, instructing the user to copy and paste content into a terminal, which is a known ClickFix attack vector designed to bypass macro restrictions and execute commands directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://crysiq.ru/uplcv?utm_term=how+to+download+a+pdf+that+is+locked
    • https://haidangpc.com/contents/files/76233864815.pdf
    • http://bjsprt.com/uploadfile/file///2021062303191571.pdf
    • http://mgtofubbq.com/uploads/files/79555690111.pdf
    • https://caribemed.com/userfiles/file/vesorobokakolobebi.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/wugod.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/91800582456.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dbaaa46c9---wosamuwegitugijirovab.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce20b750e6---55013898667.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79a6c4b91---26899720379.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/92943749c734918734748aebec360919/91819229591.pdf
    • http://braciszewska-klimek.pl/fck_files/file/garonaxikedom.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dc2aaaaeb---dizanatufewiwamalusetewo.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05cb9d78d2b78e1adab0c6cd53bc500c/molof.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/01654bf186e9d8c831a8ccf1cad7b9b0/86393947928.pdf
    • http://www.moyekolodin.com/files/kogak.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97c245df6---veguzamunolizutemigan.pdf
    • https://fruzsiflame.hu/userfiles/file/8373436074.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e69e9955de68149e6338fa3a4c103b52/77918332263.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0a705f1b74b58e652e08222896615b9f/60227780491.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6b1e2d7407e671393120505a42e5cb71/wotowudo.pdf
    • http://gayaarchi.com/userfiles/file/20210523125627.pdf
    • http://ampletrekking.com/userfiles/file/54952176161.pdf
    • https://premium-house.uz/images/file/derafuto.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ad1709e8c72212f17c4762d1cbfa76ba/xejixatekita.pdf
    • 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_off0000eced.bin
6995b0394dcf8db4cfd0a4f905471bbe9c1fb16dc7bb4154591cc61568958730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 17876 bytes
font_01_sfnt_off00011c3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 16792 bytes
font_02_sfnt_off00013454.bin
1d2380b99c749200be489a8c9c56cd5fe767b3b691d2e2ffa2d85078b2e3ceea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 10788 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.