Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0c5c185409ba9b…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 06:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e88d2bfc09b45cff5e8bae88c6d50a2b SHA-1: 1655c3542c06b84d923ae60257bbc50db18cb91b SHA-256: fe0c5c185409ba9ba44dc80629ef5619964323080003f360a3235cb6bc3e1633
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, designed to trick users into clicking embedded links. Multiple heuristics indicate it's a link farm hosted on compromised CMS uploads and disposable domains. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 69 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 http://studioarchoggianiepartners.it/userfiles/files/vunubusezokezizepagizuvu.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151c4c7702e3---22063226272.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/zobotuziridizit.pdfIn PDF document text
    • http://sireny.net/share/files/35495353518.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/37984039304.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/nudajujabikofo.pdfIn PDF document text
    • https://felicityokolo.com/file/2995971039.pdfIn PDF document text
    • http://gaudi.tw/upload/files/senoxizixuxukagazevop.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/76136334270.pdfIn PDF document text
    • https://defi128.com/userfiles/files/10642761678.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/vagajusonubi.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/75565927850.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/92090909785.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/kalagajubuz.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1615927c507d86---nefaxilusup.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4056c348---12363893412.pdfIn PDF document text
    • http://orlickachata.cz/files/files/wojolupuvagubefizux.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/monej.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9e873a622---83858670767.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/vininoliwulaposatebu.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901223753628152.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/72059836905.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/gajesebigamujunukesiro.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161401da0177b7---10328470226.pdfIn PDF document text
    • https://alariel.be/userfiles/file/60801110094.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/povanakuxirupadomejadin.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/zukipivuxodofawakude.pdfIn PDF document text
    • https://tostedboutique.com/thisIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+beat+the+secret+garden+in+merge+dragonsPDF 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_off0000b251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB251 10988 bytes
SHA-256: 0cd5fa1ea2ed28321b895869c4d882969a462d1a3d160acf549b067c699bc004
font_01_sfnt_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 14352 bytes
SHA-256: a4d7c90bb6de8f6c09bcc647a6dd7a3ff7939950accc2ebb58ab0048497cfbd9

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