Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e9917071977349…

MALICIOUS

PDF

73.8 KB Created: 2021-09-21 20:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b5305868ca7f7948ef766cdaf2cffe3 SHA-1: 8f344073c1700dc7352e7e5301e9173ee8b3fd23 SHA-256: 31e9917071977349db7977e2ff0ac227dd7a89b00dac854bdd4c332ecec6c0f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript stream further supports malicious activity, likely used to redirect users or execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=what%27s+a+euphemism PDF link annotation
    • http://badgerhillfarm.uk/69451512133.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/77600129796.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/24377498.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/62946014252.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9ff41khv0sraa074k05am806sa/65724525708.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/3752981817.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/notugigogalapuga.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/fawororit.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/69822767608.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/82578230722.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/619650b0df797094717e30d4d826530c/25806268024.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/bubureboduru.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/948aad0605f29b9060f2fc0c48e33770/81828991143.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/23259260820.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/najokarozuxafozaxefu.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/37937504559.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/12671872984.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/54351004928.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/51157977777.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/6925615258.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/lowewelo.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/nujezalivovotoj.pdfIn PDF document text
    • 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_off0000bdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 17424 bytes
SHA-256: 7ba1000c3f1c2b48713934e0e09094e4022f558335a2eda1dcd772ae772ace58
font_02_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 10272 bytes
SHA-256: 918701fc38d755b8de1a09c1885e3b9dbe1ecb3266be81300915bd6fbde7b0ab