Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc81f2484fa3422b…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 04:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7961143fc944dd6971d3848662cdba7 SHA-1: a89bf2caadc85fb4aa8a77ec9c048aa2cda137f6 SHA-256: fc81f2484fa3422b6c9b4ee1fddb6bf35b15602248d725ede5776ed04f7a180e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, containing numerous links to external sites. These sites host further PDF documents, suggesting a multi-stage phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of malicious content via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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 67 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://oancora.com/ckfinder/files/11344291823.pdf In PDF document text
    • https://lompatjauh.com/contents/files/kereme.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/tajujasezes.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109241934168355.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/84717541380.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48e52f151---lebimutinuku.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/8053679926.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-23-04-29-32-52.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/55397483815.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161558b1024bd8---nilade.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/12620832167.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kuhj3tptn4kvuvu19qnd58mos4/zosigokudi.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/muzumolomolumakimunodoge.pdfIn PDF document text
    • http://sdes.in/uploads/wumizuwixi.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/fugazogesekez.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/fafuxiwikizalubonulilunuv.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/muropawijamip.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/88691614086.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/26823311861.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/26284392019.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/pivitufosa.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614092cc096bd---midojodiwisiw.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/89519926846.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/85014503094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=simple+android+video+editorPDF 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_off0000ae9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9F 10524 bytes
SHA-256: 95b31fdecfc2b6f0d33f2c850e6c92bd3c6ca0bfdd17aeb90eac6eba8f00ccd1
font_01_sfnt_off0000c688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 14344 bytes
SHA-256: d657bd2177cc40316065febd2942bfa34581b3c9a3cfebc500374880d8bf5efd

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