Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2c7d74f38b4c97…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 12:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3aeadcc23b68241e138ece19d6b118e6 SHA-1: 332712b0fe6e9a73e9f1434469dee3a8e2bbf167 SHA-256: 8c2c7d74f38b4c9718644d28d79ae13079306ac00a87e8ae2be750d76bffbe4d
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or download additional malware. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line interface, a common tactic to bypass security warnings and execute malicious commands. The presence of numerous external links, some pointing to compromised WordPress sites, further suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://annabarons.lv/files/files/74525948109.pdf In PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/zeperisulikorak.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/ganidikaloxusumukopo.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/kujenem.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091263014_687816353.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/90554006924.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420c6401cb0---pinikubaju.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/13913767108.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/21034210777.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/pivigijugiru.pdfIn PDF document text
    • http://leruichem.com/upload/files/xolojapokewe.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/barajagesebijokoj.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a3be7153---61555260009.pdfIn PDF document text
    • http://recrute.fr/files/files/55316464386.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/zusurefe.pdfIn PDF document text
    • http://ping-property.com/user_img/files/kazogo.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/23391387685.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7074f7e82449a3818219300aee52b5a2/79801866691.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/44147138165.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161303e7ca2dd9---xuginarajapesomeb.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/puwisubuwoludiwovagem.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/21659901462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=recover+sms+androidPDF 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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 10500 bytes
SHA-256: b681fe067616dd8c7704bf5654ea944571fa589403f07ae1e951bbe3bb56d679
font_02_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 19136 bytes
SHA-256: ce607ec90951c87e1e2bb2db12f97b6280534fc479034ba44a2c30426e1ae4d6

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