Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a6c5d07d90d8ed…

MALICIOUS

PDF

70.8 KB Created: 2021-09-15 10:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89be58f28073598cc6f7bb780e541819 SHA-1: e881605d017ee5934120616061b9f4448fba691e SHA-256: 23a6c5d07d90d8ed281942453639c31d585389908f155ea53d7668d81da06326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://afslab.asia/upload/files/nibetivinagav.pdf In PDF document text
    • http://fantasymusic.it/userfiles/files/62729171283.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/34993675164.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/vaxeludokabipugiko.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a17aad46---16512333204.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/82622329360.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/47736e22604022e62db212fca019319f/lakapogodotabo.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/91587837187.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161310606769ce---56975711289.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/3810338098.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/jumososusujejuvasi.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/26711150372.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/nomoresitoxesubowinu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8494116ebcdc5c0708062510cbf9104a/kavutoz.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/62528822550.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/95969892180.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/puzifizefatavupesabisixud.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec775e5a9---pudavur.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/71214251378.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a4326c23---82699132813.pdfIn PDF document text
    • https://majubesar.info/contents/files/78292657156.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/60969264392.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090609071473499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=play+store+cache+cleanerPDF 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_off0000b684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB684 10352 bytes
SHA-256: 83b1115fe67714b73d342b9f30d3a068d17a09a0cfbdec717f32c854106e6e7d
font_01_sfnt_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 15584 bytes
SHA-256: b34ddbdd76a371dd9d689e4d30b790d68600b5c09026756d68d01179a2874ae7
font_02_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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