Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1a1db3929ccbcd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 14:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab4a79785fd3204fa1ebc9434fe05347 SHA-1: d8ca621858cb44c0456fddf67548fa41d3243f83 SHA-256: 3d1a1db3929ccbcd122d85935997181469a2c2be4cb1f11c7f3e208c78075da1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. The presence of numerous external URIs and a link farm structure points towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://liily.jp/upload/file/20210907205509.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/67a02bac641be67b571ba0aab0d80e3d/28541500126.pdfIn PDF document text
    • https://kimansion.com/uploads/file/xedufobuvalofinesafisi.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/repugaxujejalawolit.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210912235848.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/19374693388.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/9107090199.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/nonuvezobaxebojunul.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/lpieesb1glrhssvtbee8t8etrd/rerowukukapu.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/80036813811.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/25349623252.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/418123258.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/mirakojuxilinated.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/gisareburapejedaw.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/kejiru.pdfIn PDF document text
    • http://contua.org/userfiles/file/sarikuzevenaxu.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/47809596222.pdfIn PDF document text
    • https://satesayap.com/contents/files/53357163806.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/dosetamimezamefezowip.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/zofezekav.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/wilonaledabakelewudadar.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/50172047070.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d3b90e84---bekifuzasolexune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+root+android+samsung+gt+s5830iPDF 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_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 11224 bytes
SHA-256: 1012d8a8e4a610ed18624effe214a46a6031288f16a169da9d664ecd9fdc4569
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 18812 bytes
SHA-256: 0e6f3477f663eceffd375d9e9444e09ad1d7e718122e4cd6c685547d9ae47b08

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