Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1304c5501fe74ed…

MALICIOUS

PDF

78.8 KB Created: 2021-10-05 08:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4dc27c4c98bfc0f0e2882da796513233 SHA-1: dd547f15548eb9882193057221e5dc7d1806488d SHA-256: c1304c5501fe74ed00bf608eaf3f9ce11ecf3248d25db86c6b4453bb3935f1b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, pointing to multiple external URLs, some hosted on compromised CMS uploads. The ML classifier also strongly suggests maliciousness. While no scripts were directly extracted, the presence of numerous external links and the overall structure suggest an attempt to redirect users to malicious content, likely a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hbfilm.ca/resimler/files/54294608284.pdf In PDF document text
    • http://thephinhmienbac.com/upload/files/24822659310.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/folojerekawogupetuj.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615b98531a633---75151695155.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/xiredanuzewebedodula.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615bcc7c79e86---tebepenokuxupinesipe.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/77161381577.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/14718379926.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/13132761371.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/40660068271.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34032712362.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210924212347_MjI0MjAwODk1Mw==.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/pepugekezuxo.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/pipetorofawujaw.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vowojodejilalazorunebeko.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/xuzagizikowikuzaresuvo.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/25238027399.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/993d22f8313d3b8d8491321924b213a5/5516982154.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/bowubaxigizeradokizo.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/refuruminojamiwatogipigut.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/82679090068.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe959e5ee6---36528441655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=i+give+myself+away+so+you+can+use+mePDF 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_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 10800 bytes
SHA-256: 518018c5946545c8205f5e50a3bd8adc234370896cc0bab80a403583b42fd9f0
font_01_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 19060 bytes
SHA-256: 31d41d48edadeb9adca1f33a27aa237d559fe21e7f06ae87e03fdb807c5daea2
font_02_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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