Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fda514bf617e4f…

MALICIOUS

PDF

68.2 KB Created: 2021-09-19 03:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 653187252a0b025838e3c844f65379ab SHA-1: 18016cc991326d78fe7e43b8d116349167cd9985 SHA-256: 18fda514bf617e4f68d05e524ed62c0b0b4b97842e102e8f4a94760880a7bfbd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it functions as a link farm, directing users to various external domains, some of which are hosted on compromised CMS platforms. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://businesslife.com/content/files/44558764419.pdf In PDF document text
    • http://solamsys.com/userData/board/file/22004157113.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/21794879150.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/49490959093.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81434373855.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/73560076214.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/22109334244.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/maxevu.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210905_001557.pdfIn PDF document text
    • http://kite-surf.sk/files/bulokoxelokosotomo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ece1f6055eb29142f7b422bc8cae3cc6/zadafebeduwejiwumurofu.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/49995267690.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/pufali.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421b5684a8---zebilolamojikax.pdfIn PDF document text
    • http://didula.ru/img/file/vuvixupo.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/15115690389.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/64313775729.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kugururijigadudelov.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/bamakoxetiraxujasut.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/xurodurokesesajikifevog.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/80159292721.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/69485475868.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3f85aa17---foxidisinelefi.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/76116093626.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/gevamuxupabamok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+circle+of+karma+pdfPDF 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_off0000b10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10E 10572 bytes
SHA-256: 660d65d7fab1494e0a69bbfa4aefbab8cf338fd65e7b3f24b664fb4dbee2b71c
font_01_sfnt_off0000c917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC917 14040 bytes
SHA-256: b6abc8babbcf9183bf7a4df467a89e235d192716563cd94014484e62c0884f87
font_02_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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