Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18424e7133d0a9b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 20:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 230bf70a9f637537bff8bdc54074708c SHA-1: 6c8501025729b3dd87a2232c82454f718585d131 SHA-256: a18424e7133d0a9bdec008a0a65bd412d271e7713d1230bfee4f1bd1fbae84da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to various websites, many of which appear to be part of link farms or hosted on compromised CMS platforms. The presence of a QR code lure heuristic suggests the document attempts to trick users into scanning a code with their phone, likely leading to a phishing or malware download site. The file's structure and URL patterns are consistent with phishing campaigns aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=where+is+the+qr+code+reader+on+iphone PDF link annotation
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jemitajenukivetevazavur.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/72548259956.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/84451180950.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e83379e2---rawuxisidap.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381b07e90b0---julidazemikofogi.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/kositasesijadiragunolefep.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/sojezavos.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/kanopojunetadu.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/40972043952.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/5886409263.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/36244647086.pdfIn PDF document text
    • http://leruichem.com/upload/files/zebezizezasivikamolawaxol.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/59522275854.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310257c1867---jesetilulolamowed.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/zabujalagokegezasopulugap.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061502091238.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kt4dfbh28d1n3qnlio622rqse1/pebuzejizubenos.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/53639747610.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/lasisoputalodum.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/5808397638.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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 10704 bytes
SHA-256: ae34515027e2690901f9d65e5b1851faebd40ceda3222d4bd610b6ef81a879d3
font_01_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 17852 bytes
SHA-256: b421cb5977476b598d79e35034715f8dd18636300c110c58c436cd7650418d23
font_02_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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