Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20a1630714df30b…

MALICIOUS

PDF

67.8 KB Created: 2021-09-13 02:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a845ff4e5cf0cfbf0eec9b0acc537a90 SHA-1: 6230963e880f80913c400e42e7f1201e11c3d6d1 SHA-256: d20a1630714df30b40d6df4e8a797c264fd1cbffb190c3c32f8b5c46b84579d2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only appearance, and embedded clickable links. Heuristics indicate it's designed to trick users into clicking through to external sites, with many links pointing to compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://imosa.asia/uploads/files/202109130521432989.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c8c0be65---17045120557.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/jerukusifudafu.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/puziveduwurenukopoze.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/68022059317.pdfIn PDF document text
    • https://wecareprogram.org/images/file/desezur.pdfIn PDF document text
    • http://sinners-party.de/media/file/59866115558.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/retaje.pdfIn PDF document text
    • https://ubranni.com/uploader/files/purulujilevawewipaji.pdfIn PDF document text
    • http://generoussecurity.com/uploads/gitibofexabenuxeval.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f3e2de6d---39097876556.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/namemomafoj.pdfIn PDF document text
    • https://aaaxxion.info/images/file/wikuzelala.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/sedavokujiteziwusuwemut.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/23194033741.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/56iqg7miso50ogl4cf5n4tmfg7/kaduloguwekakevux.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613786c5d1a25---94244079248.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/2464192535.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/razakidagifojeforumak.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/91034564160.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/27650413439.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/zeworofezusutafokapure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=screenshot+gif+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_off0000add1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD1 14436 bytes
SHA-256: 6b96594c2823b6ba3cd003392425e179eb36d9a8457f89cacca00bb11034273f
font_01_sfnt_off0000d1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A3 10784 bytes
SHA-256: 972da18b02d529a8daf309454b73eb9a70be68ef7809c8e0433b136d2c8c7ee4
font_02_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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