Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4f819e5e42ec6a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 13:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92305b6a569d2375e1d2bff375067575 SHA-1: 5d93528dadcaa0fddc8202d05c06f4d1cccc9e2e SHA-256: fd4f819e5e42ec6a968c7e4de2d5419dc3b2837688725c4704b48eea13e9d570
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links and a heuristic indicates it's a link farm, suggesting a phishing or malware distribution attempt. The presence of a QR code lure further supports this, as it's a common tactic for directing users to malicious sites. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+do+i+open+a+qr+code+on+my+iphone PDF link annotation
    • http://maschimaurizio.it/userfiles/files/lapinakebodojijibutemin.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/tarevasawejalirazuru.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/digikodifugomovug.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219111529208870.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/72498996976.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336fbd641d4---12848180737.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210909081959_hiwlfk.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/2776301177.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210915143840_cy7e18.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/888865263.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/sijizilipejiluxuva.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/nunawagotog.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/18992985447.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/77b761d4a81f88f34fcf9ff7ab76587b.pdfIn PDF document text
    • https://termoformat.md/img/files/31442108297.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/debavolemevebolu.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/1120103551.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210901_3826810EE7C87BE6.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161387a7892515---vobozefuvi.pdfIn PDF document text
    • https://tepihtrava.rs/files/18547181026.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/wefewebipubevilanonixa.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/rugopopurofelufuti.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/notegugubujelazojaki.pdfIn PDF document text
    • http://jljemc.com/upload/files/49844409494.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/616e660c6f4ec9537e303428c2fbe089/memofasoku.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/45601153766.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_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 17672 bytes
SHA-256: 4171aff152af307452ab8bb9461085cf30a1a0fa19cf54762bf4a3b10cff36bc
font_01_sfnt_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 10804 bytes
SHA-256: 0a5fbdf9c53a895cfb098f6b1fa5d236e0e395d504993065a60773e84e4f7c40

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