Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c05bee8fd7eba7…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 22:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c6b00bdf586625f7577f4e2cf880e65 SHA-1: ea0252e9bc6e4b4a618676365872a0648f9269c2 SHA-256: 77c05bee8fd7eba7a6642897c9751cfb9a8fe44062a1936dff0bdde56f54e2c8
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of a visual download button lure further supports the intent to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=how+to+download+music+on+my+android+phone PDF link annotation
    • https://ekinyalitim.com/depo/sayfaresim/file/ladedevimekuzadilelab.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/924892541.pdfIn PDF document text
    • http://cartopack.be/Images/file/tivakekago.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/91962602987.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/30248308049.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/gurog.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/3967315051.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/waferurolurogodilok.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kujopadalepoziwipikisila.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7b5fe7d3d586f3c1cd98226c8abcd6e7/52881684292.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161409ddf7dba0---kujiwutunavajegadow.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/gepakananenuf.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/70317557731.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613120536c3c4---ninexirajamonitivozubevel.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/65479925196.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19850252932.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/mozudulukixakivumizit.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/88158079058.pdfIn PDF document text
    • http://secretinvitation.net/images/files/99501366370.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/27438865975.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364bae8a2c5---xopokokadidumamipuzereve.pdfIn PDF document text
    • 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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 18248 bytes
SHA-256: 9cee4023ee98624c7ded73d0edd69d185d2e17b4027f54e23e2331cdf00bfcb9
font_01_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 11072 bytes
SHA-256: db6cc5f30b18f770f0bfd84adc6871ca6484094a46c9f1967ebe94ee513c5c98

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