Malicious PDF — malware analysis report

Static analysis result for SHA-256 45435835b9d4e2ea…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 08:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 153d4d6fcdbd80becd95e3b58934efb4 SHA-1: 4ba9b1c9e4bcb7ac22677359d2d59def98a876b1 SHA-256: 45435835b9d4e2eae436ff86a34f14199c20e6ce6fd6fcfe49555d197ca52444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS platforms, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure align with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/esjs1d3mqel8ro90qhhi62jsc2/91310813606.pdf In PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/79693864849.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/xefufoxiwisegijodexovafi.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1d38d4a7---tegajoveperibubeka.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/28594028080.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/safevigi.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/43951261994.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/jatogoxaxi.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/6359523499.pdfIn PDF document text
    • https://matratva.in/userfiles/file/31666156754.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/zagofedokolisejowixuri.pdfIn PDF document text
    • https://hoavily.com/uploads/files/63925256113.pdfIn PDF document text
    • http://gibisch.info/files/files/motebewulirurepebalozuto.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/25036968307.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/12ace2eb09db623e1277e5bc7dbebc22/15978765315.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/94245137445.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/51567689092.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/sowixuz.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/povaxosuxizigik.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/sutexazuxuwajebikukek.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52be147dc---34408357872.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161355b00e63c6---lomawiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=outlast+apk+obbPDF 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_off0000b325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 10176 bytes
SHA-256: 0c18926dd707a52410ea4b4af865cf666889e07bee72e9c2eb2b1327e41ac074
font_02_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 15092 bytes
SHA-256: b76f61bd393eb59563d9bc0bcedad44905a85a2790288d229ec5337d23dc37e1

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